Old clocks and watches & their makers, being an historical and descriptive account of the different styles of clocks and watches of the past, in England and abroad, to which is added a list of ten thousand makers (1904)
Britten, F. J. (Frederick James), 1843-1913 · London, B. T. Batsford · leaf 539
considerablefriction. Of others, curved somewhat to the shape of a pothook,there are still examples, but eventually the more convenient andcorrect form was found to be a \-olute which had at first but one ortwo coils. The coils were increased to four or five as the advantageof a longer spring was… … Fig. 691.—Hogs bristle as abalance controller. Mtcluiiiisii! of Clocks and ]]atchcs 525 To lengthen or shorten the acting length of the spring, Tompionappears to have used the circular slide with an index from the first.This arrangement,-which remained in favour for a long period, is
Clocks and watches · Clock and watch makers
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