J titufifit �tutritau. Atlantic and the efficient condition of her machinery on ! The most reliable form of self· registering thermometer I when burned. The presence . of much magnesia seems to arrival here ought to remove all doubt as to the practicability is an upright mercurial thermometer behind which is. have in all cases an injurious effect; all excellent hydraulic of the system. passed by clockwork a strip of sensitized paper. In front i lime contains very little magnesia . • • • I • of

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... t is placed a light of sufficient actinic power to blacken I Erdmenger, who has studied the constitution of Portland THERlIOMETERS. the paper above the mercury column. This gives not. cement very carefully, concludes that it is not a defi nite . The word thermometer means a heat-measure, hence any I merely the maxima and minima but all variations of tempe-. chemical compound. He considers it rather as water glass, lUstrument employed to measure heat should be called. rature.