US Patent No. 734,834, granted July 28, 1903 to Clare H. Draper of Hopedale, Massachusetts, assignor to the Draper Company. It describes a shedding cam for looms with steel harness, where the heddles are slotted and also act as warp stop-motion detectors. The cam raises the harness frame quickly, then slows it just as the harness bar picks up the heddles, and finishes the rise with harmonic motion, which reduces jerking and warp breakage. The patent includes drawings of the loom mechanism and the cam, a detailed specification, and six claims.