Annual report of the Commissioner of Patents (1837)
United States. Patent Office · [Washington, D.C.] : Patent Office · leaf 94
ition, 6, required for signalizing a letter.O is a side view of the disc, K; Hs the rim of the disc, with its holders;A is a portion of the axis of the disc, shown as broken off; c represents a■<»■—, . I . ,, . . . __» * They who are desirous of obtaining an account of most of the telegraphic… … silver band surrounding a pulley or hub upen the axis, and directly behindthe disc. Upon the hub are metallic ribs 6, parallel with its axis, cor-responding in number to the letters on the dial. Each rib forms a metal-lic contact with the silver band c, and are separated from each other bypieces of…
United States. Patent Office · Patents · Agriculture
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