American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 209
t the detached piece extendsbackward in the direction of the length of thespring (Fig. 15). This arrangement has the effect that thepressure of this piece against the inside ofthe barrel increases with the tension of thespring, while with Philippes arrangement, thetraction of the spring diminishes… … main spring itself is sufficient; and its resist-ance may be increased by the grooves in thebarrel, and by a projection punched at theend of the piece, and lessened by shorteningthe same. I think a spring arranged in thisway would soon make friends, because itoffers all the advantages of the free…
Clocks and watches
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