Messerschmitt Me 262 Used by the Luftwaffe

Messerschmitt Me 262 Used by the Luftwaffe Specifications (Me 262 A-1a) General Length: 34 ft. 9 in.Wingspan: 41 ft.Height: 11 ft. 6 in.Wing Area: 234 sq. ft.Empty Weight: 8,400 lbs.Loaded Weight: 15,720 lbs.Crew: 1 Performance Power Plant: 2 x Junkers Jumo 004B-1 turbojets, 8.8 kN (1,980 lbf) eachRange: 652 milesMax Speed: 541 mphCeiling: 37,565 ft. Armament Guns: 4 x 30 mm MK 108 cannonsBombs/Rockets: 2 x 550 lb. bombs (A-2a only), 24 x 2.2 in. R4M rockets Origins Though best remembered as a late-war weapon, the design of the Messerschmitt Me 262 began prior to World War II in April 1939. Spurred by the success of the Heinkel He 178, the worlds first true jet which flew in August 1939, the German leadership pressed for the new technology to be put to military use. Known as Projekt P.1065, work moved forward in response to a request from the Reichsluftfahrtministerium (RLM - Ministry of Aviation) for a jet fighter capable of at least 530 mph with a flight endurance of one hour. Design of the new aircraft was directed by Dr. Waldemar Voigt with oversight from Messerschmitts chief of development, Robert Lusser. In 1939 and 1940, Messerschmitt completed the initial design of the aircraft and began building prototypes to test the airframe. Design Development While the first designs called for the Me 262s engines to be mounted in the wing roots, issues with the power plants development saw them moved to pods on the wings.  Due to this change and the increased weight of the engines, the aircrafts wings were swept back to accommodate the new center of gravity. Overall development was slowed due to continued issues with the jet engines and administrative interference.  The former issue often was a result of the necessary high-temperature resistant alloys being unavailable while the latter saw notable figures such as Reichsmarschall Hermann Gà ¶ring, Major General Adolf Galland, and Willy Messerschmitt all oppose the aircraft at different times for political and economic reasons. Additionally, the aircraft that would become the worlds first operational jet fighter received mixed support as many influential Luftwaffe officers who felt that the approaching conflict could be won by piston-engine aircraft, such as the Messerschmitt Bf 109, a lone. Originally possessing a conventional landing gear design, this was changed to a tricycle arrangement to improve control on the ground. On April 18, 1941, the prototype Me 262 V1 flew for the first time powered by a nose-mounted Junkers Jumo 210 engine turning a propeller. This use of a piston engine was the result of ongoing delays with the aircrafts intended twin BMW 003 turbojets. The Jumo 210 was retained on the prototype as a safety feature following the arrival of the BMW 003s. This proved fortuitous as both turbojets failed during their initial flight, forcing the pilot to land using the piston engine. Testing in this manner continued for over a year and it was not until July 18, 1942, that the Me 262 (Prototype V3) flew as pure jet. Streaking above Leipheim, Messerschmitt test pilot Fritz Wendels Me 262 beat the first Allied jet fighter, the Gloster Meteor, into the skies by about nine months. Though Messerschmitt had succeeded in out-pacing the Allies, its competitors at Heinkel had first flown their own prototype jet fighter, the He 280 the previous year.  Not backed by the Luftwaffe, the He 280 program would be terminated in 1943. As the Me 262 was refined, the BMW 003 engines were abandoned due to poor performance and replaced by the Junkers Jumo 004. Though an improvement, the early jet engines possessed incredibly short operational lives, typically lasting only 12-25 hours. Due to this issue, the early decision to move the engines from the wing roots into pods proved fortuitous. Faster than any Allied fighter, production of the Me 262 became a priority for the Luftwaffe. As a result of Allied bombing, production was distributed to small factories in German territory, with around 1,400 ultimately being bu ilt. Variants Entering service in April 1944, the Me 262 was used in two primary roles. The Me 262 A-1a Schwalbe (Swallow) was developed as a defensive interceptor while the Me 262 A-2a Sturmvogel (Stormbird) was created as a fighter-bomber. The Stormbird variant was designed at Hitlers insistence. While over a thousand Me 262s were produced, only around 200-250 ever made it to frontline squadrons due to shortages in fuel, pilots, and parts. The first unit to deploy the Me 262 was Erprobungskommando 262 in April 1944. Taken over by Major Walter Nowotny in July, it was renamed, Kommando Nowotny. Operational History Developing tactics for the new aircraft, Nowotnys men trained through the summer of 1944 and first saw action in August. His squadron was joined by others, however, only a few of the aircraft were available at any given time. On August 28, the first Me 262 was lost to enemy action when Major Joseph Myers and Second Lieutenant Manford Croy of the 78th Fighter Group shot one down while flying P-47 Thunderbolts. After limited use during the fall, the Luftwaffe created several new Me 262 formations in the early months of 1945. Among those becoming operational was Jagdverband 44 led by the famed Galland. A unit of select Luftwaffe pilots, JV 44 began flying in February 1945. With the activation of additional squadrons, the Luftwaffe was finally able to mount large Me 262 assaults on Allied bomber formations. One effort on March 18 saw 37 Me 262s strike a formation of 1,221 Allied bombers. In the fight, the Me 262s downed twelve bombers in exchange for four jets. While attacks such as this frequently proved successful, the relatively small number of available Me 262s limited their overall effect and the losses they inflicted generally represented a tiny percentage of the attacking force. Me 262 pilots developed several tactics for striking Allied bombers. Among methods preferred by pilots were diving and attacking with the Me 262s four 30mm cannons and approaching from a bombers side and firing R4M rockets at long range. In most cases, the Me 262s high speed made it nearly invulnerable to a bombers guns. To cope with the new German threat, the Allies developed a variety of anti-jet tactics. P-51 Mustang pilots quickly learned that the Me 262 was not as maneuverable as their own planes and found that they could attack the jet as it turned. As a practice, escorting fighters began flying high over the bombers so that they could quickly dive on German jets. Also, as the Me-262 required concrete runways, Allied leaders singled out jet bases for heavy bombing with the goal of destroying the aircraft on the ground and eliminating its infrastructure. The most proven method for dealing with the Me 262 was to attack it as it was taking off or landing. This was largely due to the jets poor performance at low speeds. To counter this, the Luftwaffe constructed large flak batteries along the approaches to their Me 262 bases. By wars end, the Me 262 had accounted for 509 claimed Allied kills against approximately 100 losses. It is also believed that a Me 262 flown by Oberleutnant Fritz Stehle scored the final aerial victory of the war for the Luftwaffe. Postwar With the end of hostilities in May 1945, the Allied powers scrambled to claim the remaining Me 262s. Studying the revolutionary aircraft, elements were subsequently incorporated into future fighters such as the F-86 Sabre and MiG-15. In the years after the war, Me 262s were used in high-speed testing. Though German production of the Me 262 ended with the conclusion of the war, the Czechoslovak government continued building the aircraft as the Avia S-92 and CS-92. These remained in service until 1951. Selected Sources Stormbirds: Me 262Me 262

Vanadium Facts (V or Atomic Number 23)

Vanadium Facts (V or Atomic Number 23) Vanadium (atomic number 23 with symbol V) is one of the transition metals. Youve probably never encountered it in pure form, but it is found in some types of steel. Here are essential element facts about vanadium and its atomic data. Fast Facts: Vanadium Element Name: VanadiumElement Symbol: VAtomic Number: 23Group: Group 5 (Transition Metal)Period: Period 4Appearance: Blue-gray metalDiscovery: Andrà ©s Manuel del Rà ­o (1801) Vanadium  Basic Facts Atomic Number: 23 Symbol: V Atomic Weight: 50.9415 Discovery: Depending who you ask: del Rà ­o 1801 or Nils Gabriel Sefstrom 1830 (Sweden) Electron Configuration: [Ar] 4s2 3d3 Word Origin: Vanadis, a Scandinavian goddess. Named after the goddess because of vanadiums beautiful multicolored compounds. Isotopes: There are 20 known isotopes of vanadium ranging from V-23 to V-43. Vanadium has only one stable isotope: V-51. V-50 is nearly stable with a half-life of 1.4 x 1017 years. Natural vanadium is a mostly a mixture of the two isotopes, vanadium-50 (0.24%) and vanadium-51 (99.76%). Properties: Vanadium has a melting point of 1890/-10 °C, boiling point of 3380 °C, specific gravity of 6.11 (18.7 °C), with a valence of 2, 3, 4, or 5. Pure vanadium is a soft, ductile bright white metal. Vanadium has good corrosion resistance to alkalis, sulfuric acid, hydrochloric acid, and saltwater, but it oxidizes readily at temperatures exceeding 660 °C. The metal has good structural strength and a low fission neutron cross section. Vanadium and all of its compounds are toxic and should be handled with care. Uses: Vanadium is used in nuclear applications, for producing rust-resistant spring and high-speed tool steels, and as a carbide stabilizer in making steels. Approximately 80% of the vanadium that is produced is used as a steel additive or ferrovanadium. Vanadium foil is used as a bonding agent for cladding steel with titanium. Vanadium pentoxide is used as a catalyst, as a mordant for dyeing and printing fabrics, in the manufacture of aniline black, and in the ceramics industry. Vanadium-gallium tape is used to produce superconducting magnets. Sources: Vanadium occurs in approximately 65 minerals, including vanadinite, carnotite, patronite, and roscoelite. It is also found in certain iron ores and phosphate rock and in some crude oils as organic complexes. Vanadium is found in small percentages in meteorites. High purity ductile vanadium may be obtained by reducing vanadium trichloride with magnesium or a magnesium-sodium mixture. Vanadium metal also may be produced by calcium reduction of V2O5 in a pressure vessel. Vanadium  Physical Data Element Classification: Transition MetalDensity (g/cc): 6.11Electronegativity: 1.63Electron Affinity: 50.6 kJ/molMelting Point (K): 2160Boiling Point (K): 3650Appearance: soft, ductile, silvery-white metalAtomic Radius (pm): 134Atomic Volume (cc/mol): 8.35Covalent Radius (pm): 122Ionic Radius: 59 (5e) 74 (3e)Specific Heat (20 °C J/g mol): 0.485Fusion Heat (kJ/mol): 17.5Evaporation Heat (kJ/mol): 460Debye Temperature (K): 390.00Pauling Negativity Number: 1.63First Ionizing Energy (kJ/mol): 650.1Oxidation States: 5, 4, 3, 2, 0Lattice Structure: Body-Centered CubicLattice Constant (Ã…): 3.020CAS Registry: 7440-62-2 Vanadium Trivia Vanadium was initially discovered in 1801 by the Spanish-Mexican mineralogist Andres Manuel del Rà ­o. He extracted the new element from a sample of lead ore and found salts formed a multitude of colors. His original name for this colorful element was panchromium, meaning all colors.del Rio renamed his element erythronium (Greek for red) because the crystals of vanadium would turn red upon heating.The French chemist Hippolyte Victor Collet-Descotils claimed del Rà ­os element was actually chromium. del Rà ­o retracted his discovery claim.Swedish chemist Nils Sefstrà ¶m rediscovered the element in 1831 and named the element vanadium after the Scandinavian goddess of beauty Vanadis.Vanadium compounds are all toxic. Toxicity tends to increase with oxidation state.The first commercial use of vanadium steel was the chassis of the Ford Model T.Vanadium is paramagnetic.The abundance of vanadium in the Earths crust is 50 parts per million.The abundance of vanadium in seawater is 0.18 par ts per billion. Vanadium(V) oxide (V2O5) is used as a catalyst in the Contact Process to manufacture sulfuric acid.Vanadium is found in the proteins known as vanabins. Some sea species of sea cucumbers and sea squirts have yellow blood because of the vanabins in their blood. Sources Featherstonhaugh, George William (1831). New Metal, provisionally called Vanadium. The Monthly American Journal of Geology and Natural Science: 69.Marden, J. W.; Rich, M. N. (1927). Vanadium. Industrial and Engineering Chemistry. 19 (7): 786–788. doi:10.1021/ie50211a012Sigel, Astrid; Sigel, Helmut, eds. (1995). Vanadium and Its Role in Life. Metal Ions in Biological Systems. 31. CRC. ISBN 978-0-8247-9383-8.Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.

Sidney becket Research Paper Example | Topics and Well Written Essays - 1000 words - 1

Sidney becket - Research Paper Example Bechet’s contributions to jazz music helped to define and legitimize the genre in creating recognition for the form as complex and engaging. Although different accounts dispute whether or not he could read music, he preferred not to, his ear perfect and suited for defining music to get to its soul. Bechet was born in 1897 to a family that was part of the Creole culture of New Orleans. Creole origins refer to those of Spanish or French heritage that populated the New Orleans region. Black Creole refers to those children of plantation owners and slaves that were able to gain their freedom. According to the Black Code of 1724, children of owners and slaves were allowed to be freed and could then own land. Many of the Black Creoles owned plantations and held successful businesses, giving them a vital position in New Orleans society. From the freedoms that money allowed, came the opportunity to pursue the arts. As well, most of their children were sent to France for an education and this wealthy class tended to be more associated with their European roots than the America in which they lived. Classical music was a part of the culture, and when combined with ragtime, European style dance music, and rich traditions of folk music, jazz was born (Kirchner 48). Thus, a great number of j azz musicians came out of New Orleans. Bechet’s musical talent was discovered when he was just a child. He bought a ten cent tin flute when he was twelve and revealed his talent on this toy instrument in such a way as to impress earn him the title â€Å"Wizard of Jazz†. He soon got a clarinet and took to disassembling the instrument and turning up randomly at the concerts of local bands and taking the stage. He left the audiences in awe of his talent (31). After his adolescence, he traveled the United States playing his music until he was discovered by Will Marion Cook in 1919 who offered him a space in the New York

Military Pay Assignment Example | Topics and Well Written Essays - 1250 words

Military Pay - Assignment Example In order to carryout this research, some of the resources that must be carried include electronics e.g. a laptop and mobile phone. Laptop will help in recording and storing information collected from the informants. This is a reliable storage facility because information is permanently stored. Writing materials are very essential when carrying out research. This is because the activity involves lots of recording. The researcher notes down information gathered from the informant in a notebook. These are mainly short notes that are later expounded when compiling data. Biro pens should also be enough for the number of people intended to fill the questionnaires.According to Nasu (2009), money is a major resource. In order to carry out any research, the researcher should ensure that he/she has enough funds. Most of the activities need money. For instance, money is needed to cater for transport purposes. In order to collect reliable data, the researcher should collect data in different reg ions and from different military officers then compare. Money is needed to cater for food and accommodation. What and where the researcher will eat, rest and sleep has to be paid for. The researcher should have enough airtime to feed their mobile phone to enable communications to take place, pay assistants who help in carrying out research as well as be in a position to cater for his and their medical needs. I will buy some gifts to motivate the informants. Finally, I will have the questionnaire and survey questions. that will be used to carry out the survey at hand. Personnel In order to carry out this research successfully, I have to hire somebody who will assist me carryout various activities. For instance, he/she will help me in distributing questionnaires to informants and collecting them after they have been filled. The research assistant will help in collection and documentation of data. Secondly, I will need somebody to help me go through areas I may not be familiar with. During data collection, I will visit different areas some which I may never have been before and that is why I may need somebody’s assistance. It may be difficult to access some of the areas I will have to visit because of poor or lack of roads. In this case I will need somebody to take me there through other means like motorbikes or animal transport like camels. Finally, I will need somebody to type and print the report after data collection and analysis has been completed (Orakhelashvili, 2011)

Dickinson vs Whitman Essay -- essays papers

Dickinson vs Whitman Two Poets, Walt Whitman and Emily Dickinson are probably two of the most influential people in American poetry. They are regarded as the founders modern American poetry. Walt Whitman (1819-1892), for the time was breaking new ground with his diverse, energetic verse with regards to subject matter, form and style whether talking about overlooked objects in nature such as a single blade of grass or even our own hearing. Emily Dickinson (1830-1886) while living a life of seclusion, never really leaving her birthplace, was very adventurous internally. She was well read in English literature, often deeply exploring her own thoughts. While Dickinson and Whitman are referred to as the founders of modern American poetry, they are strikingly different. While Whitman’s poems are large and expansive, the lines long and visually descriptive, Dickinson’s works, in contrast, are highly compressed, squeezing moments of intense emotions and thought into tight four line stanzas whi ch contract feeling and condense thought. If one was to compare Whitman’s Crossing Brooklyn...

American Psychological Association Essay

Psychology has been defined as the study of human behavior, or a science that deals with mental and emotional processes. The American Psychological Association (2010) defines it as a diverse subject which is grounded in science, having numerous applications in everyday life. Given that any discipline is subject to continuous growth, psychology was not initially termed as a science until the mid nineteenth century. It is therefore a young science compared to other natural sciences which have a long history, but it is growing rapidly. Nevertheless, for it to be a science it must possess some scientific characteristics that describe every discipline termed as such. On the other hand, science is usually described as systematic knowledge derived from study and observation, or a branch of knowledge that systematizes facts, principles and methods. Since the purpose of this essay is to discuss psychology as a science, the integral part will give an insight into some of the characteristics of psychology that qualify it as a science. Studies of Milar, & Fuchs, (2002) indicate that the discipline of psychology has its roots in Germany back in the mid nineteenth century. It resulted from the British and the continental philosophies of mind and advances of research in sensory physiology. Before then, it was only the philosophers who were in pursuit of know how related to the mind and some of its processes. However, a challenge emerged in the late eighteenth century declaring that it was not possible to study mind scientifically. The challenge was eventually overcome in the nineteenth century after the emergence of a possibility of study of mind within the field of philosophy by adoption of experimental methods used to study the physiology of the senses. As a result, the new psychology came about and has continued to grow and develop. Psychologists have contributed greatly not only for the sake of its growth, but also with an aim of maintaining it as a scientific discipline through the employment of scientific methods. Psychology contains some of the characteristics that are common with other sciences. For instance, biology is the study of the living things and physics is the study of the physical world. Similarly, psychology is basically the study of human behavior, a phenomenon that can be observed. Although a number of people argue that some branches of psychology study things that cannot be observed like fear, sciences equally study things such as gravity which cannot be seen and are still considered scientific. The study method used is also very important. Any science utilizes scientific methods in its study. Simond (2008) indicates that since the mid nineteenth century, psychology has been applying scientific methods in the study of the full range of both human and non-human behavior. In addition, its application is scientifically based. Due to its diverse nature, there are many topics in psychology because it is very diverse, but systematic observation is incorporated in all the topics. Objectivity which is a core characteristic of any scientific study, is well incorporated in most of the psychological studies. In any objective study, the researcher does not impose any ideas that may be biased or incorporate elements of his personal beliefs. In most of the psychological studies, psychologists may bring into play laboratory studies which are largely controlled such that they cannot be biased by the researcher’s beliefs. For quite sometime, physiological, cognitive and behavioral approaches have been using objective methods like laboratory experiments. However, it has been argued that an objective and value free study is not actually possible because scientists usually have a preconceived notion and they consider other factors especially during the diagnosis of psychological problems (Simond, 2008). Psychology like other science makes use of theories to explain some psychological phenomena. For instance, there are several personality theories which explain the different personality types. In addition, there are theories that give details concerning the causes of a disorder like schizophrenia. It bears noting that one of these theories explains that schizophrenia is caused by biological factors. Although there are some psychological theories which cannot be tested, some of these theories are found in other sciences are generally accepted. The research done by Lutus (2009) reveals that the role of each science is to develop reasonable explanations known as â€Å"theories describing realities†. Moreover, the justifications are supposed to be based on real evidence which is gathered and evaluated disregarding the feelings or passions of the researcher. In addition, most of the psychological theories that have been tested fit in this category quite well. Although the discipline of psychology is still going through revolution, various studies affirm that psychologists have established various laws and principles which are universally acceptable. For instance, behavior is largely viewed as a product of consequences. Much as it may be argued that it is not very easy to have laws and principles in psychology without the influence of other factors, the same problem affects other natural sciences. Considering the fact that psychology has developed some laws and principles and is still in the process of developing it can be affirmed that it is indeed a science. Simond (2008) states that, whether psychology has ever had paradigm is currently an issue that is raising a lot of debate. From a psychologist’s point of view, the subject had undergone through a number of revolutions such that psychology has had a number of paradigms. Moreover, psychology can be stated as being in a stage of a normal science as its current paradigm is cognitive approach. A keen study of psychology illustrates that although there are some perspectives which may not be scientific, a majority of the outlooks fall under scientific perspectives. On the same note, behavioral, cognitive-developmental, cognitive and physiological approaches fall under scientific perspectives. It is only humanistic and psychodynamic approach which is thought to be slightly idiographic. The social approach is intermediate because it appreciates the role of science in psychology and still incorporates other sociological and environmental factors. All factors put into consideration, the fact is that psychology is a science because it mostly employs scientific approaches. As stated by Simond ‘the issue of psychology as a science is cloudy’ (2008, Para 6). On one hand, it is a science that studies human behavior and all the aspects related to the same such as memory. In the process carrying out these studies, various variables are measured and controlled to a certain point. Laboratories are used to improve the controls and to make them as systematic as possible and as a result, general laws about behavior are formed or established. On the other hand, psychology tends to partially deviate from the scientific perspectives since it does not aim at generalizing human behavior. In some instances, scientific methods are not useful especially where the focus is on individual differences and the experiences that people go through. In some cases, psychology utilizes some methods which are non-scientific such as the case studies as well as the unstructured interviews. Either way it is worth noting that, psychology developed from both scientific and non scientific disciplines which are physiology and philosophy respectively. However, ever since psychology started operating independently, it has always taken the model of the natural sciences. Moreover, it has made numerous contributions in the scientific study of human behavior (Simond, 2008). As depicted by the findings of this paper, it is therefore possible that psychology can be viewed as a science in spite of the fact that it does not concur with some of the traditional scientific specifications. Since it follows the scientific methods which have helped to advance other natural sciences such as physics, chemistry and biology, it qualifies to be termed as a science. In addition, psychology has so many characteristics that are still possessed by other sciences. It equally entails several theories, some of which have been developed in to testable hypothesis. Various laws and principles developed from the psychological studies have been generalized such that they can be applicable in different parts of the world. It however stands out that the issue of referring to psychology as a science is contentious but there is solid evidence to defend it. Word Count 1354 Bibliography: American Psychological Association.(2010). About APA. Retrieved June 4, 2010, from http://www. apa. org/about/ Lutus, P. (2009). Is Psychology a Science? Retrieved June 4, 2010, from http://www. arachnoid. com/psychology/index. html Milar, K. , & Fuchs, A. (2002). Psychology as a Science. Retrieved June 4, 2010, from http://media. wiley. com/product_data/excerpt/01/04713832/0471383201. pdf Simond, M. (2008). Psychology – A Science As Well As an Art. Retrieved June 4, 2010, from http://ezinearticles. com/? Psychology- ¬- ¬- ¬A- ¬Science- ¬As- ¬Well- ¬As- ¬an- ¬Art&id=961082

Theory of Demographic Transition Essay - 1200 Words

The Theory of Demographic Transition Demography is the study of the components of population variation and change. Death rate and birth rate are two determinants of population change. Theory of Demographic Transition is comparatively recent theory that has been accepted by several scholars throughout the world. This theory embraces the observation that all countries in the world go through different stages in the growth of population. A nations economy and level of development is directly related to that nations birth and death rates. Population history can be divided into different stages. Some of the scholars have divided it into three and some scholars have divided it into five stages. These stages or classifications demonstrate a†¦show more content†¦But the death rate exceeds the birth rate, which triggers the population increasing very slowly or almost stable. In this stage, birth rate becomes high due to less use of contraception and sterilization. Most of the people do survive in agriculture where the c hildren are considered as economic assets and so people are encouraged to get many children. Similarly death rate becomes high due to diseases, natural calamities, wars, etc. Infant death rate is also found very high. Because of poor health facilities provided by the state to the people, lack of clean water and sanitation and food shortage, health of the people will be weak so that the people will depart the life in high numbers. Before 1920, China and India were at this stage (Raj, H. 2003). This stage is generally found in the countries where people depend on agriculture as a main source of surviving. At present, the countries like Nigeria, Ethiopia, Tanzania, Angola, etc. are passing through this stage (Raj, H.2003) The Early Expanding Stage: This is the second stage of the Theory of Demographic Transition. In this stage, birth rate does not come down from the High Stationary Stage but death rate gets very much declined, which triggers very rapid growth in the population change. In this stage, the nation provides the better public health services to the people so that the people will not depart from the life so rapidly, and the declining in infantShow MoreRelatedThe Demographic Transition Theory941 Words   |  4 Pagesfactors that could be the cause of this. Looking at the demographic transition theory in conjunction with the Malthusian theory brought valuable insight for me. The demographic theory says there are four stages to population growth that are predictable. Those who are in their late 80’s and above were capable of seeing all four of these stages in America. As they aged and the stages for population advanced so did technology. 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