American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 116
a seriousthing in the course of a day or a week. I still believe that a wooden rod, properlycompensated, comes most nearly to the ma.thematical idea of a true pen.durum. If a wooden rod wereused, and a ball of glass withtubes for mercurial adjust-ment, something like the ac-companying diagram, I… … 110 AMERICAN HOROLOaiCAL JOURNAL. Let B and C be two holes made in theglass, or, if the bob be steel, bored in thesteel in which to put the mercury for com-pensation. When I have opportunity, Imean myself to test this thing. If any ofyour readers feel like trying the plan, as I dontwish to patent…
Clocks and watches
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