 | 1847 - 490 páginas
...temperature. My first attempts were to discover the point at which the metal begins to emit light. come sensible to feeble impressions of light, I caused...when this took place. The metal had therefore dilated j£T of its length ; the elevation of its temperature was about 917°, which added to the existing... | |
 | 1847 - 492 páginas
...temperature. My first attempts were to discover the point at which the metal begins to emit light. come sensible to feeble impressions of light, I caused...when this took place. The metal had therefore dilated T|T of its length ; the elevation of its temperature was about 917°, which added to the existing height... | |
 | 1847 - 490 páginas
...degrees ; they are therefore to some extent in error. By the aid of resisting wires of different length and a rheostat, I was able to vary the force of the...when this took place. The metal had therefore dilated T£T of its length ; the elevation of its temperature was about 917°, which added to the existing... | |
 | 1847 - 906 páginas
...therefore to some extent in error. I3y the aid of resisting wires of different lengths and a rheostat, 1 was able to vary the force of the electric current...when this took place. The metal had therefore dilated ^|^ of its length ; the elevation of its temperature was about 917°, which added to the existing height... | |
 | 1877 - 974 páginas
...were placed in a dark room, the temperature of which was 60° F. ; and after I had remained therein a sufficient length of time to enable my eyes to become...that the index to which the platinum was attached marked a temperature of 917° when this took place. This, added to the temperature of the room, 60°,... | |
 | John William Draper - 1878 - 502 páginas
...were placed in a dark room, the temperature of which was 60° Fahr.; and after I had remained therein a sufficient length of time to enable my eyes to become...when this took place. The metal had therefore dilated -^ of its length ; the elevation of its temperature was about 917°, which, added to the existing height... | |
 | 1847 - 448 páginas
...some extent in error. By the aid of resisting wires of different lengths and a rheostat, 1 was able lo vary the force of the electric current in the platinum,...when this took place. The metal had therefore dilated ^|-¥ of its length ; the elevation of its temperature was about 917°, winch added to the existing... | |
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I had remained there a sufficient length of time to enable my eyes to become sensible to feeble impressions of light, I caused the current to pass, gradually increasing its force, until the platinum was visible. In several repetitions of this experiment... 