American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 279
out making the spring softer than the oilmade it, providing no part of the spring isbrought past a blue color. 270 AMERICAN HOROLOGICAL JOURNAL. A, Fig. 26, represents another form of spring,which probably is the best that can be made.It is, however, a little difficult to make. Thisspring is made… … off oil, as was described in tempering the otherspring. Perhaps the best way to fasten a steelspring to the wheel is to use two screws. It isnot much more work, and there is no danger ofthe steady pin coming out when the spring isbeing hardened. It is better to use two weak springs than onestrong…
Clocks and watches
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