Spar-torpedo instructions for the United States Navy

"Spar-torpedo instructions for the United States Navy" is a naval manual written in the late 19th century. It explains how to equip, handle, fire, and maintain spar-torpedoes from ships and boats, with emphasis on electrical firing gear, gun-cotton safety, and standardized Navy fittings. The opening of the manual defines the Class D spar-torpedo outfit and distinguishes service, exercise, and contact torpedoes, describing their cases, stuffing-boxes, circuit-closers, spars, fittings, and cabling. It then lays out step-by-step procedures for priming with dry gun-cotton, testing detonators, splicing and fuzing, shipping torpedoes on secondary spars, and conducting circuit tests and firings from ships and boats, including immersion and stand-off distances; it also covers converting a service torpedo to contact firing and outlines improvised powder torpedoes. Subsequent sections summarize the firing batteries, battery tester, hand-firing key, testing magneto, and Farmer dynamo machines (A and C), with clear testing and operating routines, wire insulation practices, and splicing methods. The portion concludes with thorough guidance on packing, stowage, inspection schedules, and drying methods for wet and dry gun-cotton and detonators, followed by an appendix of inspector duties, outfit inventories, and stowage weights and spaces.