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Show fiolulo.ii of I liold Mr. Tho problem ot the exact field of usefulness use-fulness of liquid air has been simplified by tho elimination, for the pretent at least, of one class of work for which It was claimed that the new lliiuld would prove highly efficient as a blasting agent. A paper reccnll) riad before the Urltluli Institution ot Mining Engineers En-gineers described some tests re. .ntly made. In tho Slmplon tunnel with ia t-rldges, t-rldges, which consisted of a wrapper filled with a carbonaceous material and placed bodily In liquid air until It was completely .saturated It wss found that, owlpg to tho rapid evaporation, the useful life ot the charge was very abort Ihe cartridge had to be fire I within fifteen minute after being taken out of tho liquid air otherwise thcro was danger of n misfire Tho disruptive effects, however, were said to bo comparablo to those ot dynamite |