dge, so that the operation is slow and consequently the melting point of ice, recourse must be had to expensive. An improvement on this primitive method liquid air, which can now be easily produced by the is shown in the accompanying illustration. It con- Linde process. The following is the method… … of the gasoline which may be maintained minutes when the thermometer was be- CUTTING ASPHALT WITH STEAM ROLLER. low freezing. Obviously this is a very constant if the flow of liquid air is suit- cheap and simple method of doing what has heretofore ably regulated. For this, M. d’Arsonval uses two…
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