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902,650
pound by friction caused by the rubbing to- gether of two or more of the finished articles. From the foregoing description of my present invention it will be clearly evident 5 that I have produced a pyrotechnic device which is perfectly safe from premature or accidental ignition. The composition usually consists of the above-mentioned -ingredients, preferably by 10 the weights stated, but it will be understood, and I am fully aware of the fact that the pro- portions of the ingredients by weight may be changed without departing from the spirit and scope of the present invention, as set 15 forth in the appended claims. Hence I do not limit my invention to the exact propor- tions of the various ingredients named in the foregoing specification. I 'claim:- 20 1. The herein described pyrotechnic de- vice comprising a suitable pyrotechnic com-- .position capable of being exploded by per-
cussion and inclosed within a safety-coating comprising a wrapper of tissue paper having its outer surface gummed, and a-protecting 25 coating adhering to said gummed surface, substantially as described. 2. The herein described pyrotechnic de- vice comprising. a suitable pyrotechnic com- position capable of being exploded by per- 30 cussion an enclosed within a safety-coating comprising a wrapper of tissue paper having its outer surface gummed, and a layer of wood-pulp adhering to said gummed surface, substantially as and for the purposes set 35 forth. In testimony, that I claim the invention set forth above I have hereunto set my hand this thirtieth day of September, 1907. CHARLES F. GRABER. Witnesses: * GEORGE D. RICHARDS, EVELYN R. LESSER.