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Life and works Hooke's microscope , from an engraving in Micrographia. Much of what is known of Hooke's early life comes from an autobiography that he commenced in but never completed. In the chapter Of Dr. Robert was the last of four children, two boys and two girls, and there was an age difference of seven years between him and the next youngest. Robert Hooke was expected to succeed in his education and join the Church.
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Pantograph

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Comprehensive Singer Sewing Machine Model List Classes

History[ edit ] The first pantograph was constructed in [1] by Christoph Scheiner , who used the device to copy and scale diagrams, but he wrote about the invention over 27 years later, in "Pantographice" Rome By changing the positions of the arms in the linkage between the pointer arm and drawing arm, the scale of the image produced can be changed. Diagram illustrating the principles used by William Wallace's eidograph In , Professor William Wallace — invented the eidograph to improve upon the practical utility of the pantograph. Drafting[ edit ] The original use of the pantograph was for copying and scaling line drawings. Modern versions are sold as toys. By adjusting the needles different enlargement or reduction ratios can be achieved. This device, now largely overtaken by computer guided router systems that scan a model and can produce it in a variety of materials and in any desired size, [5] was invented by inventor and steam pioneer James Watt — and perfected by Benjamin Cheverton — in
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At the Mountains of Madness

It was queer state of sensations The effect of the monstrous sight was indescribable. It was, very clearly, the blasphemous city of the mirage. The toughness of the things was almost incredible. We ran like mad for the sane outer air.
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Idiophones Idiophones form a diverse and disparate group. Concussion instruments, consisting of two similar components struck together, include clappers, concussion stones, castanets , and cymbals. Percussion idiophones, instruments struck by a nonsonorous striker, form a large subgroup, including triangles and simple percussion sticks; percussion beams, such as the semanterion ; percussion disks and plaques, single and in sets; xylophones , lithophones sonorous stones , and metallophones sets of tuned metal bars ; percussion tubes, such as stamping tubes, slit drums, and tubular chimes; and percussion vessels varying from struck gourds and pots to gongs , kettle gongs, steel drums , bells , and musical cups. Bronze Egyptian sistrum, dated after bc crossbars and jingles are modern ; in the British Museum, London. Membranophones Musical instruments in which the sound-producing medium is a vibrating membrane fall into four main groups:
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