es so as to lift the rock from its bed without shattering it to such an extent.
The number of fatal explosions resulting from it have been an obstacle to its more general use, but these are claimed to have resulted generally from improper manufacture, exposure to too great heat in transportation, or carelessness in handling.
Mowbray's nitro-glycerine Apparalus.
Among the most prominent accidents occurring from these sources were the explosions at Aspinwall and in the office of Wells, Fargo, & Co. at San Francisco, by the former of which forty-five and by the latter six lives were destroyed.
In the case of the Aspinwall disaster the nitroleum had been shipped from Hamburg, where the temperature was 55° or 60° to a tropical climate where the temperature in the hold of the steamer was probably more than double this.
It was inclosed in cork-stopped vessels, packed in cases with sawdust.
The explosion has been attributed to the disengagement of gas, which, by the corrosion of