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*21) The Eccalobeion
*22) Maelzel's Automaton Chess-player.
*23) Babbage's Calculating Machine.
*24) Chabert, and since him, a hundred others.
*25) The Electrotype.
*26) 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.
(*27) Newton demonstrated that the retina beneath the influence of the
violet ray of the spectrum, vibrated 900,000,000 of times in a second.
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*28) Voltaic pile.
*29) The Electro Telegraph Printing Apparatus.
*30) The Electro telegraph transmits intelligence instantaneously- at
least at so far as regards any distance upon the earth.
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