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By Ian McNeil

* 22 sections disguise the whole box of the background of know-how and every part summarises the advance of its topic from the earliest occasions to the current day* Written with out pointless jargon* 2 broad indexes of Names and subject matters* Usefully illustrated with a hundred and fifty black & white photos and line drawings to give an explanation for key advances`Contain[s] an unlimited volume of trustworthy info over a really extensive box. it truly is definitely a piece of which I shall myself make widespread use ... it merits to discover a spot ... in each reference library.' - occasions larger schooling Supplement`The assurance is great ... a most useful single-volume resource which for its comprehensiveness and straightforwardness of reference will earn its position in either professional and common reference collections.' - Reference Reviews`Informative and entire, outstanding in its assurance ... covers each element of expertise from the Stone Age to the distance Age ... will certainly aid readers to get a grip on and consider of an incredible variety of matters ... a useful and functional addition to most department bookshelves or libraries.' - New Civil Engineer`The authors represented during this booklet are to be congratulated for his or her readable and trustworthy surveys of the earlier and current prestige of the main components the place mankind has harnessed technological know-how for the creation of worthy items and processes.' - selection

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He applied for a patent, but was opposed by claims from other Dutch spectacle makers. The secret was out and, within a year, a Dutch ‘perspective’ or ‘cylinder’ was displayed at the Frankfurt fair, was on sale in Paris, seen in Venice and Padua and, by the end of 1609, was being made in London. These telescopes were made virtually without any understanding of the principles of optics, but needed only a competence in the grinding and polishing of lenses, craftsman’s work. The true inventor of the microscope is not known, there being several claimants to the invention.

Helical gears were developed by Robert Hooke in 1666. There being then no machinery for cutting such teeth, he built them up from a series of laminations which were staggered or progressively displaced when the faces of the teeth were then filed smooth. Ten years later Hooke devised the universal joint named after him and contributed much to later mechanical engineering. Early machines in Egypt It was not until about the time of Christ that Hero of Alexandria classified the five basic machines as the lever, the wheel and axle, the wedge, the pulley and 17 INTRODUCTION the screw, but the first three of these had been in common use since about 3000 BC.

There being then no machinery for cutting such teeth, he built them up from a series of laminations which were staggered or progressively displaced when the faces of the teeth were then filed smooth. Ten years later Hooke devised the universal joint named after him and contributed much to later mechanical engineering. Early machines in Egypt It was not until about the time of Christ that Hero of Alexandria classified the five basic machines as the lever, the wheel and axle, the wedge, the pulley and 17 INTRODUCTION the screw, but the first three of these had been in common use since about 3000 BC.

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