=Time of Burning.= One foot in thirty seconds. =Composition.= Train of slow match inside a wrapping of hemp or flax, covered by layer of gutta-percha, surrounded by binding of black waterproof tape. =INSTANTANEOUS OR QUICK FUSE= Color, red. Ribbed surface. =Time of Burning.= Eighty feet per second. =Composition.= Same as service fuse, except that it contains quick match in place of slow match. =Caution.= Instantaneous fuse must never be stored alongside safety fuse. =DETONATORS= =SERVICE= =No. 8 Mark VII= =Description.= Copper tube open at one end painted red, marked on white label, No. 8. M.K. VII containing 32 grs. fulminate of mercury. =COMMERCIAL (Long)= =COMMERCIAL (Short)= =Description.= Copper tube, open one end, containing 25 grs. fulminate of mercury. =EXPLODERS= =SERVICE= =Guncotton.= One-oz. primer, 15-oz. slab. See Explosives, Guncotton. =No. 2 Detonator for Hand Grenade.= Consists of brass tube (detonator holder) with flat screw head. The other end is fitted with a cavity which carries N.G. percussion cap. A commercial detonator open end toward the screw head is placed inside, its open end closed with a wooden plug; the closed end is pierced with four flash holes to enable flash from percussion cap to communicate with F. of M. in detonator. A brass screw in head of detonator holder closes detonator tube. This detonator has three screw threads. =No. 3 Detonator.= See description of No. 2. This detonator is ¼ in. longer than No. 2, and has two screw threads. =PATENT LIGHTERS= =Nobel Lighter.= (See Plates 8 and 9.) The lighter is made up of two cardboard tubes, one fitting over the other; inside the end of the larger tube is a small brass cap containing friction composition. At the top of the smaller tube are two friction points. These points are held about ¼ in. from the cap containing friction composition, by a safety pin passing through both tubes. At the other end of the smaller tube is a small copper band into which the fuse can be crimped. A narrow band of waterproof tape with a loose end is glued around the joint of the two tubes to keep out moisture. =To Assemble.= Insert fuse into lighter, fasten by crimping, and insert other end of fuse into detonator. The joints at lighter and detonator should be waxed to make it damp-proof and flash-proof. =Brock Lighter.= See Grenade Hand. Consists of a small cardboard cup filled with friction composition, covered with waterproof paper. The latter can be torn off by pulling a small tag which is left free.