A College Course of Laboratory Experiments in General Physics (Paperback)

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: ...bulb, B, by the method of experiment 24. Place it in a steam bath (Fig. 46) and leave for about ten minutes. Open the stopcock for a few seconds only, then remove the bulb from the bath. Fill the stem above the stopcock with mercury, then immerse the whole bulb in mercury in the narrow porcelain dish provided (see Fig. 47) and fasten it securely in position by means of strong rubber bands. Place the whole in a larger dish and surround bulb and trough completely with shaved ice, then open the stopcock. After an interval of ten minutes, close the stopcock, measure or estimate the height of the surface of the mercury above the orifice of the bulb, remove, shake out the mercury above the stopcock, and, after the temperature has risen to that of the room, weigh. Fill the bulb completely with mercury and weigh again. This data together with the weight of the empty bulb, the temperature of the room and the temperature of the steam, is sufficient for the determina COEFFICIENT OF EXPANSION OF AIR 49 tion of the required coefficient. Let c be the coefficient sought, M the weight of the mercury which fills the bulb, m the weight of the mercury which enters the bulb, /' the temperature of the steam, Pb the barometric pressure, and P1 the pressure at the orifice of the bulb when immersed in mercury. We shall make an error of but a small fraction of i per cent, if we neglect the expansions of the mercury and the glass, quantities which affect the result in opposite senses. If this is done we have at once: ' " (Show how this formula is obtained.) 30. SPECIFIC HEAT OF SOLIDS. Weigh the substance whose specific heat is sought and place it in the slanting tube of the steam bath as shown in Fig. 48. Weigh the inner vessel of the calorimeter, then add about 175 gms. of wat...