American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 117
. HOROLOGIST. o MR. GROSSMANS MERCURIAL PENDULUM. We have received from Mr. Grossman thofollowing diagram of his mercurial pendu-lum, as compared with the Graham pendu-lum, both being one-sixth the actual size ofa seconds pendulum. He has also promised another article onthe subject for the next… … AMEEICAN HOEOLOGICAL JOURNAL. 109 FILES. It may not be uninteresting to many ofour readers to know something more aboutfiles than their use. They are very exten-sively manufactured at heme as well asabroad, and their commercial value is com-mensurate with their world-wide utility.There is scarcely…
Clocks and watches
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