carefully boiled until entirely dissolved, when 75 dropsammonia is added, the solution shaken and allowed to settle.If tin is present, it will separate as amorphous oxide of tinin white flakes. We venture the suggestion that lead canbe determined in a similar manner by precipitating on zinc. —-——… … THE GLOBE STEAM GAGE. The amount of correspondence concerning boiler explo-sions, which has been lately published in scientific journalspoints out the importance of a trustworthy pressure indica-tor, which can be relied on, at all times, to show any varia-tion in the force within the boiler, and to…
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