id ure cut or score the adjoining sheet, thus weakening it. manner. These two rods being placed horizontally, are The cracking of the head around the bolt of the plain boiler, at the eXperiments of March 7 and 8, probably ren- nn — MECHANICAL INVENTIONS. dered it impossible to get a breaking strain… … An improved system for transmitting ScrENTIFIC AMERICAN, namely, that motion has been patented by Mr. Anto- the pressure always fell on ‘opening nio Samper, of Paris, France. This the gate valve, and then the gauge Ps gradually to the pressure of the springs, and the carbons can patent relates to…
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