e and one-fourth pounds, the service charge for a six-pound round ball, while the weight of the new pro- the pressure on the blast was seriously reduced by its friction in passing through the small arch pipes; but the jectile was over 12} pounds. Eighteen shots were fired effect in the reduction of… … tant), and 19 shots fired. Five of these entered the much increased, that one oven like that shown in Figs. In the annexed engraving, Fig. 1 represents a perspec- board at from three and a half to four feet of the center. 6 and 7 was found to be capable of heating the blast for tive view of the…
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