first having the ends primed or dipped into a solution composed of salt- peter and nitrate of lead. The covering is done on marble slabs. A number of the red covers are pasted at a time and laid one over the other so that the ends are about one half inch apart. The cracker is placed over the top… … Fig. 2_VERTICAL SECTION AND PARTIAL PLAN VIEW OF THE BOILER. Sixty hands turn out about 50,000 crackers per day. new Uncle Sam cannon cracker is madeof an ex- with fine gunpowder, is placed into this hole and a plosive composition of chlorate of potash, bichro- quantity of clay is put into the top…
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