Watches : the Paul M. Chamberlain collection at the Art Institute of Chicago (1921)
Art Institute of Chicago · Chicago : The Institute · leaf 14
alance cock, worm screw set-up forspring arbor. Dust cap. George Graham,London, No. 104. Graham is usually ac-corded the credit of perfecting the cylin-der escapement, although the substitutionof steel scape wheel for the brass scapeof the English was probably of Swissorigin. Graham succeeded his… … No. 11—DEBAUFRE ESCAPEMENT
Chamberlain, Paul Mellen, 1865-1940 · Clocks and watches
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