Latent heat of fusion of ice . The results of these determinations indicate that for commercialcan ice, commercial plate ice, natural ice, ice frozen in the labora-tory from air-free double-distilled water and from double-distilledwater containing air, all of which were very pure as indicated byelectrical conductivity tests, the heat of fusion is the same towithin the limits of accuracy of the earlier determinations, i. e.,about i part in iooo. Further experiments on the three com-mercial forms of ice fail to show differences greater than about ipart in 5000. Five observations on ice co
Latent heat of fusion of ice . The results of these determinations indicate that for commercialcan ice, commercial plate ice, natural ice, ice frozen in the labora-tory from air-free double-distilled water and from double-distilledwater containing air, all of which were very pure as indicated byelectrical conductivity tests, the heat of fusion is the same towithin the limits of accuracy of the earlier determinations, i. e.,about i part in iooo. Further experiments on the three com-mercial forms of ice fail to show differences greater than about ipart in 5000. Five observations on ice contaminated with a mixture ofammonia, sodium chloride, and calcium chloride to the extent ofabout 1 part in 1000 give results about per cent lower than forpure ice. The mean of the final 21 determinations on samples of plate,can, and natural ice gave for the heat of cal 15 per gram mass,or Btu per pound mass,or Btu per pound weighed in air against brass or iron weights. Washington, August 20, A berg about 40 feet high and 300 feet long. Sighted July 1, 1912
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