moderate materials than any flying machines in America, none has been more sys- The Calorimeter.—This apparatus is constructed to of the other models. Here we see the old market, tematic and thorough than that of the members of Dr. measure the amount of heat given off by the detona- with its space… … and project its flame immediately into the inflammable flying machine. gas mixture. Gelatine dynamite and other high-grade As a result of a preliminary correspondence with THE SCIENTIFIC AMERICAN TROPHY. dynamites may be classed in this list. On the other several leading aviators, we feel certain…
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