English: The Obry steering-device found in Whitehead torpedoes. The gyroscope is labelled F, G, H. Published in The Whitehead Torpedo U.S.N., 1898, a manual for the most important early torpedoes used by the U.S. Navy. The book covers the 45c/m. x 3.55m. Mark I, Mark II, Mark III and and 45c/m. x 5m. Mark I.

Details of Obry Gear:

A frame. B valve-body. D air-cushion cylinder. E frame-lugs. F gyroscope wheel. G inner ring. H outer ring. I impulse-sector. M boss. O stop-arm. V vertical rock-shaft. W centering-arm. X boss arm. Y rock-shaft spring. Z counter-weight. a control-pin. b valve-arm. c valve-plug. dd valve-plug adjusting-screws. ee valve-plug springs. g valve guard. h air-pipe to valve. j steering-rod coupling. ll frame pivot clamping-screws. nn outer-ring pivots. oooo outer-ring clamping-screws.

v counter-weight jamb-nut.