This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 Excerpt: ...=-0.25 = 000. Boiling-point Thermometer in steam. 99.6, 99.5. Mean, 99 55 = 9.. Barometer corrected for temperature and latitude, 75.7, 75.6. Mean pressure during experiment, 75.65. Temperature of steam at 75.65 pressure, 100 = 99.87 = t.. Hence 0O =-0.25. A Correction at zero = +0.25. 6. = 99.58. t. = 99.87..'. ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 Excerpt: ...=-0.25 = 000. Boiling-point Thermometer in steam. 99.6, 99.5. Mean, 99 55 = 9.. Barometer corrected for temperature and latitude, 75.7, 75.6. Mean pressure during experiment, 75.65. Temperature of steam at 75.65 pressure, 100 = 99.87 = t.. Hence 0O =-0.25. A Correction at zero = +0.25. 6. = 99.58. t. = 99.87..'. Correction at boiling-point = + 0.. The true temperature, when the thermometer reads 100, ia: Questions and Problems. 1. What is the true temperature when your thermometer reads 40? 2. Is the calculation just made of the correction: lt intermediate points accurately true? If not, why is it inaccurate? 8. A thermometer is so graduated as to read 10 in melting ice and 70 in steam at normal pressure; what is the temperature on the centigrade scale when the reading on this thermometer is 50? 4. Which experiment, should be performed first, determining the zero reading or the boiling-point? EXPERIMENT 45 Object To determine the coefficient of linear expansion of a solid rod or wire. (See " Physics," Art. 169.) General Theory. By definition, the average coefficient of linear expansion of a substance between two temperatures, and ta is _A-'. h(-J where /, and are the lengths of a linear dimension at?i and ta, respectively. Consequently, the method is to measure the change in the length of the rod or wire between the two temperatures and to substitute in the formula. The change in the length, i--lv is the quantity which is in general the most difficult to measure, owing to its minuteness, and particular care must be devoted to its measurement. The general method is to have the rod or wire so fastened to one end of a lever that the least change of length of the rod or wire produces a great motion of the other end of the lever, and this can be r...
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