# A manual of practical physics, for students of science and engineering (Google eBook)

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Page 172 - F., the testings should commence. To this end insert the torch into the opening in the cover, passing it in at such an angle as to well clear the cover, and to a distance about half way between the oil and the cover. The motion should be steady and uniform, rapid and without any pause. This should be repeated at every two degrees...
Page 128 - Consider a rectangular rod of length L', breadth B, and depth D, fixed at one end and weighted at the other. The rod will become bent as in the figure. The upper portion of the rod is extended and the lower portion compressed. Since the rod is strained by a longitudinal stress, and since Young's modulus is defined as the ratio of the longitudinal stress to the longitudinal strain, Young's modulus may be determined from an observation of the amount of bending which a given force produces in the rod....
Page 89 - The Specific Gravity or relative density of a substance is the ratio of its density to the density of some standard substance.
Page 171 - ... above. Care must be taken that the oil does not flow over the flange. Remove all air bubbles with a piece of dry paper. Place the glass cover on the oil cup, and so adjust the thermometer that its bulb shall be just covered by the oil.
Page 172 - The appearance of a slight bluish flame shows that the flashing point has been reached. "In every case note the temperature of the oil before introducing the torch. The flame of the torch must not come in contact with the oil. "The water bath should be filled with cold water for each separate test, and the oil from a previous test carefully wiped from the oil cup.
Page 31 - ... determined and not assumed. (2) Errors in the standard masses may be corrected as explained under Experiment 15. (3) and (4) Errors due to difference in the lengths of the balance arms and to difference in the masses of the scale pans can be nearly eliminated by weighing the body first in one pan and then in the other. Let...
Page 172 - Replace the oil cup and pour in enough oil to fill it to within one-eighth of an inch of the flange joining the cup and the vapor-chamber above. Care must be taken that the oil does not flow over the flange. Remove all air-bubbles with a piece of dry paper.
Page 209 - The rate at which a body cools is proportional to the difference between the temperature of the body and that of the surrounding air. If a body in air at 25°C will cool from 100" to 75° in one minute, find its temperature at the end of three minutes.
Page 172 - As a flash torch, a small gas jet, one-fourth inch in length, should be employed. When gas is not at hand, employ a piece of waxed linen twine. The flame in this case, however, should be small. When the temperature of the oil has reached 85...
Page 207 - ... the muslin envelope is thoroughly moist. CHAPTER XIV CALORIMETRY CALOEIMETRY is the theory and art of measuring quantities of heat. Unfortunately there is no single quantity of heat that is universally adopted as the unit. A common unit in scientific 'work is the amount of heat required to raise the temperature of one gram of water from 15° C. to 16° C. This unit is called the 15° calorie or simply the calorie or the gram-degree-centigrade thermal unit. In the British system the unit adopted...