American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 217
ance arms had a longnotch in it to receive a stud in place of the collet, to which the inner end of the springwas fixed, and which could be easily moved toand fixed at any distance from the centre. Insetting the balance in motion, the lever, ofcourse, moved to and fro, turning on its pivotsalways… … the ends; sometimes equally to and fro,sometimes much more when the spring ex-panded than when it contracted. Thesedifferences were about the same in eachcoil, provided the relative positions of theends were the same, only they were moreconspicuous as the spring got shorter. Thegreatest deviation…
Clocks and watches
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