d tion in the accompanying illustration the contact of Improvement in Thermometers, the brush with the commutator cylinder is a rolling Mr. Lupin, of Munich, has recently called attention instead of a sliding one. The improvement has been to two thermometers that are free from certain incon-… … fect than with sulphuric acid, is satisfactory between 0° and 50° C. : without fastenings of any kind. The side pieces of These two solutions do not solidify, even at the tem- eylinder carried by the armature shaft is of ordinary perature of evaporation of snowy carbonic acid, and, the back of the…
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