[PATENT MODEL]. Patent model for a device for guiding torpedo boats by John A. Ballard [N.p., 1870] An original device with three electrical apparatus, a cross bar, and alternating switch, all mounted onto a wooden base (175 x 182 x 68 mm). With accompanying photos and COA from the United States Patent Model Foundation (some aging to mechanism, some wear to photos and COA). An interesting item, designed for steering boats from shore batteries via electrical current (although originally granted the patent in 1870, Ballard lost the patent to John Lay by Lay?s appeal in 1873). Official Gazette of the United States Patent Office, Tuesday, June 24, 1873 pp. 687-688.