Watches : the Paul M. Chamberlain collection at the Art Institute of Chicago (1921)
Art Institute of Chicago · Chicago : The Institute · leaf 12
, and the return to sensible pro-portions of later date. The experiments shown in balancesprings begin with the small numberedspiral, extending through the cylindricalspring of Houriet, the combined spiral andcylinder of Hammersley, the wide sweepover coil of Frodsham, the double spring ofsome… … No. 10—PERSPECTIVE CYLINDERAND ESCAPE WHEEL detached lever, and many others unfamiliareven to most watchmakers. One examplemarked Breguet, and another by Arnold,have cylinders made most exquisitely ofruby or sapphire. In devices for winding, intervening be-tween the key wind and the stem wind,may…
Chamberlain, Paul Mellen, 1865-1940 · Clocks and watches
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