56

The Eccalobeion

57

Maelzel's Automaton Chess-player

58

Babbage's Calculating Machine

59

Chabert, and since him, a hundred others

60

The Electrotype

61

Wollaston made of platinum for the field of views in a telescope a wire one eighteen-thousandth part of an inch in thickness. It could be seen only by means of the microscope.

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