APPENDIX. Duties of the Inspector of Ordnance—List of Articles in Outfit—Weights—Stowage Space 51 INDEX 59 PLATES 69 Spar-Torpedo Instructions. CHAPTER I. SPAR-TORPEDO OUTFIT. GENERAL DESCRIPTION.—CARE AND PRESERVATION. _Class D._—Includes one set of Ship‘s Torpedoes, Service and Exercise, one set of Boat‘s Torpedoes, Service and Exercise, and one set of circuit-closers and appurtenances for the conversion of Service into Contact Torpedoes. Service and Exercise Torpedoes are to be used from ships and boats; Contact Torpedoes from boats only. Many articles in a Torpedo Outfit are common to the different sets comprised in Class D, in which case similar articles are classed together for convenience of stowage and transportation. If the whole of Class D is not issued, then only a proportionate part of those articles designated as “Spare” are issued. Articles that belong exclusively to any one set are issued with that set only. SERVICE TORPEDO. =Pattern D.—Plate I.= (Twenty-four are issued.—Twelve for use from ships and twelve from boats.) This torpedo, intended for use from either ships or boats, is 12⅜ inches long and 9 inches square, inside measurement, and is made of sheet iron tinned inside and out, coated inside with shellac and painted outside with asphaltum. Around a filling hole in the top is soldered a brass ring having on its inner circumference, a screw-thread for a brass screw-cover which bears a stuffing-box for the entrance of the spar leading-wires. A rubber washer between the cover and ring makes the case water-tight. Riveted to the top is a tinned malleable iron frame fitted with four lugs. A handle secured to two of the lugs forms a brace for the spindle that attaches the torpedo to the secondary spar; this spindle has two curved arms at one end that straddle the handle and secure to the other two lugs by screw-bolts, a projection on the crown of the handle fitting into a recess in the stem of the spindle. To the bottom of the case is riveted a tinned malleable iron plate for attaching a circuit-closer. The primer-case, 8⅛ inches long and 3 inches square, inside measurement, is made of tin coated inside and out with shellac and is closed at one end. The torpedo-case, empty but complete except the spindle, weighs about 15 lbs. The charge of the torpedo, including the primer of 2½ lbs. of dry gun-cotton, is equivalent to about 34 lbs. of dry gun-cotton. When issued, the torpedo-cases are completely filled with wet gun-cotton, the screw-cover is screwed down tight and the hole in the stuffing-box is closed tight by screwing down the water-cap over the spherical rubber packing placed sideways in its seat. EXERCISE TORPEDO. =Pattern D.—Plate II.=