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It should, however, be noted, and this remark has doubtless some interest for the theories of photographic action, that photographic substances retain, even at the temperature of liquid hydrogen, a very considerable part of their sensitiveness to light. Sir James Dewar has made some important applications of low temperatures in chemical analysis; he also utilizes them to create a vacuum.
Some fifty years since, when the kinetic theory was in its infancy, Faraday liquefied carbonic-acid gas, among others, and the experiments thus inaugurated have been extended by numerous more recent investigators, notably by Cailletet in Switzerland, by Pictet in France, and by Dr. Thomas. Andrews and Professor James Dewar in England.
If we had seen the Heavenly Dove overshadowing us, and heard the voice saying, 'This is My beloved Son, hear ye Him, we should have been doubtless overwhelmed; but could hardly have had a more real sense of the presence of Him who made the heavens and the earth, the trees, the grass, and the new creature in Christ Jesus. Mr. Dewar served two tables and gave the concluding address; and Mr.
Ammonium platinocyanide, cooled while stimulated by arc light, glows fully at 180°; but on warming it glows like a lamp. It seems clear," Professor Dewar adds, "that the substance at this low temperature must have acquired increased power of absorption, and it may be that at the same time the factor of molecular friction or damping may have diminished."
Inside was a peculiar shaped flask, open at the top, but like a vacuum bottle. "A Dewar flask!" ejaculated Craig. "What is it?" asked Elaine, appealing to him. "Liquid air!" he answered. "As it evaporated, the terrific pressure of expanding air in the safe increased until it blew out the door. That is what caused the cold sweating and the groans." We watched him, startled.
As early as 1892, Mr Parkinson thought of improving the output by recovering the cold produced by liquid air during its evaporation; but an incorrect idea, which seems to have resulted from certain experiments of Dewar the idea that the phenomenon of the liquefaction of air would not be, owing to certain peculiarities, the exact converse of that of vaporization led to the employment of very imperfect apparatus.
Ellis, one of the surgeon's mates, who will furnish you with some drawings and accounts of the various birds which will come to your possession. He has been very useful to me in your service in that particular, and is, I believe, a very worthy young man, and, I hope, will prove worthy of any services that may be in your way to confer upon him. "The two clerks of the two ships, Mr. W. Dewar and Mr.
J. M. Dewar, who occupied a small one-floored cottage standing by itself in Cumberland Street, a large and broad thoroughfare on the outskirts of the town. Dewar was a butcher by trade, a young man, some eighteen months married, and father of a baby girl. Robb, on seeing smoke coming from Dewar's house, woke his son, who was a member of the fire brigade.
Professor Farmer, the botanist, investigates cancer, and the ordinary educated man, familiar though he is with their general results, would find it hard to say which were the chemists and which the physicists among Professors Dewar and Ramsey Lord Rayleigh and Curie. The classification of sciences that was such a solemn business to our grandfathers is now merely a mental obstruction.
Dewar, who alone could have told something, never recovered consciousness and died on the day following the crime. Three considerable wounds sufficient to cause death had been inflicted on the unfortunate woman's head, and five of a similar character on that of her husband.
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