American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 178
hapeand length, a modification was substituted,differing from it in having the ends unitedby an interposed piece of solid metal, thus di-viding the S into two parallel compound bars.Only a few of these were made, because ofthe more simple form which was patented andadopted in 1782, by Mr. Earnshaw,… … a a are the mean time screws ; the slidingpieces have a concave groove, deep enoughto form a bed for the expansion bar, and se-cured by the set screw c; it will of course beknown that these blocks are for adjusting totemperature. These weights he makes byturning in the lathe a brass ring, which…
Clocks and watches
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