1950s Friden STW-10 Electro-Mechanical CalculatorFor Restoration or DisplayCondition is used and Untested -
Missing Power Cord (I believe it is a RCD socket)Please Review all pictures to see the condition.Sold AS IS - No WarrantyNO RETURNS
Own this Piece of History! Friden calculators had the reputation of being the \'Cadillac\' of calculators
The Friden STW10 from the 1949 is a substantial fully-automatic calculator with a separate multiplier keyboard.To perform a multiplication, the operator enters the first factor on the main keyboard, and the second on the 10-key auxilliary keyboard on the left-hand side. Pressing \"Mult\" performs a normal multiplication, \"Acc Mult\" adds the result to the previous contents of the register, and \"Neg Mult\" subtracts the result from the previous value. Stored for many yearsWhat a magnificent example of mathematical history!Hard to find and very rare. 13-1/2\"W x 14-1/2\"D x 8-1/2\"H, Carriage Width 18\"
Weighs approximately 40 lbs.

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History
For broader coverage of this topic, see History of mathematics.One of the earliest known mathematicians was Thales of Miletus (c. 624 – c. 546 BC); he has been hailed as the first true mathematician and the first known individual to whom a mathematical discovery has been attributed. He is credited with the first use of deductive reasoning applied to geometry, by deriving four corollaries to Thales\'s theorem.The number of known mathematicians grew when Pythagoras of Samos (c. 582 – c. 507 BC) established the Pythagorean school, whose doctrine it was that mathematics ruled the universe and whose motto was \"All is number\".[2] It was the Pythagoreans who coined the term \"mathematics\", and with whom the study of mathematics for its own sake begins.The first woman mathematician recorded by history was Hypatia of Alexandria (c. AD 350 – 415). She succeeded her father as librarian at the Great Library and wrote many works on applied mathematics. Because of a political dispute, the Christian community in Alexandria punished her, presuming she was involved, by stripping her naked and scraping off her skin with clamshells (some say roofing tiles).[3]Science and mathematics in the Islamic world during the Middle Ages followed various models and modes of funding varied based primarily on scholars. It was extensive patronage and strong intellectual policies implemented by specific rulers that allowed scientific knowledge to develop in many areas. Funding for translation of scientific texts in other languages was ongoing throughout the reign of certain caliphs, and it turned out that certain scholars became experts in the works they translated, and in turn received further support for continuing to develop certain sciences. As these sciences received wider attention from the elite, more scholars were invited and funded to study particular sciences. An example of a translator and mathematician who benefited from this type of support was al-Khawarizmi. A notable feature of many scholars working under Muslim rule in medieval times is that they were often polymaths. Examples include the work on optics, maths and astronomy of Ibn al-Haytham.The Renaissance brought an increased emphasis on mathematics and science to Europe. During this period of transition from a mainly feudal and ecclesiastical culture to a predominantly secular one, many notable mathematicians had other occupations: Luca Pacioli (founder of accounting); Niccolò Fontana Tartaglia (notable engineer and bookkeeper); Gerolamo Cardano (earliest founder of probability and binomial expansion); Robert Recorde (physician) and François Viète (lawyer).As time passed, many mathematicians gravitated towards universities. An emphasis on free thinking and experimentation had begun in Britain\'s oldest universities beginning in the seventeenth century at Oxford with the scientists Robert Hooke and Robert Boyle, and at Cambridge where Isaac Newton was Lucasian Professor of Mathematics & Physics. Moving into the 19th century, the objective of universities all across Europe evolved from teaching the \"regurgitation of knowledge\" to \"encourag[ing] productive thinking.\" In 1810, Humboldt convinced the king of Prussia, Fredrick William III, to build a university in Berlin based on Friedrich Schleiermacher\'s liberal ideas; the goal was to demonstrate the process of the discovery of knowledge and to teach students to \"take account of fundamental laws of science in all their thinking.\" Thus, seminars and laboratories started to evolve.[6]British universities of this period adopted some approaches familiar to the Italian and German universities, but as they already enjoyed substantial freedoms and autonomy the changes there had begun with the Age of Enlightenment, the same influences that inspired Humboldt. The Universities of Oxford and Cambridge emphasized the importance of research, arguably more authentically implementing Humboldt\'s idea of a university than even German universities, which were subject to state authority.[7] Overall, science (including mathematics) became the focus of universities in the 19th and 20th centuries. Students could conduct research in seminars or laboratories and began to produce doctoral theses with more scientific content.[8] According to Humboldt, the mission of the University of Berlin was to pursue scientific knowledge.[9] The German university system fostered professional, bureaucratically regulated scientific research performed in well-equipped laboratories, instead of the kind of research done by private and individual scholars in Great Britain and France.[10] In fact, Rüegg asserts that the German system is responsible for the development of the modern research university because it focused on the idea of \"freedom of scientific research, teaching and study.\"
Required educationMathematicians usually cover a breadth of topics within mathematics in their undergraduate education, and then proceed to specialize in topics of their own choice at the graduate level. In some universities, a qualifying exam serves to test both the breadth and depth of a student\'s understanding of mathematics; the students who pass are permitted to work on a doctoral dissertation.
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