American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 270
AN HOROLOGICAL JOURNAL. 345 The nature of my invention consists in thecombination of two metals of different degreesof expansibility, so arranged as to completelyovercome all the expansion and contractionof any simple pendulum rod, and can be usedin any pendulum clock. One very importantadvantage… … 8 Wrought steel ^ of an inch thick. Z Zinc ^ of an inch square (cast). C Any common metal. B Screws for adjusting. H Steady pins. P Pendulum ball, W Pendulum wire. In its construction I have used two piecesof good hammered steel {S) filed and dressednearly square, and filed away at the centreabout…
Clocks and watches
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