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-because they were useful in applying carefully graded degrees of force . A sketch in the Utrecht Psalter ( abo +8 shows a man sharp ng a sword a grindstone , which another man turns by means of a crank .
Opposite to these , again , were planted two balks coupled in the same fashion , at a distance of forty feet from base to base of each pair , slanted against the force and onrush of the stream . These pairs of balks had two - foot ...
Being a skilled mathematician he shows how , with such a device , the force applied and the distance moved vary inversely according to mechanical advantage . In fact , Heron comes close to discovering the modern technical concept of ...
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LibraryThing ReviewCrítica de los usuarios - PDCRead - LibraryThing
This was originally written in 1962, and is therefore is a little dated. Sprague de Camp has written a book all about the different civilisations and the technologies that that invented or acquired ... Leer comentario completo
LibraryThing ReviewCrítica de los usuarios - Schmerguls - LibraryThing
5609. The Ancient Engineers, by L. Sprague De Camp (read 21 Jan 2019) This book was first published in 1963 and hence its bibliography includes nothing after that date. It undertakes to tell of the ... Leer comentario completo
One The Coming of the Engineers
Three The Mesopotamian Engineers
Four The Greek Engineers
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