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A laboratory manual of physics for use in secondary schools (Inglés) Tapa blanda – 6 mar 2012

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Tapa blanda, 6 mar 2012
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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. 1911 Excerpt: ...much steam is condensed upon a body of known mass and specific heat when heated through a certain temperature interval; to find the latent heat of vaporization by the steam calorimeter method. What to do. (1) Lay the board upon the table so that one of its ends extends a foot or so over the edge of the table top. Clamp the other end fast or lay a heavy weight upon it. Set the balance on the board so that its pillar is about even with the edge of the table. Fasten the laths together with loops of string or wire as shown, and suspend from the lower one the calorimetric body by a wire or thread long enough to permit the body to hang nearly to the bottom of the calorimeter set on the floor. (2) Remove the calorimetric body and weigh the suspension laths and wires to centigrams. Thread the suspension wire of the calorimetric body through the center hole of the calorimeter cover, attach the body, and weigh again, adjusting the position of the calorimeter, if needs be, so that the suspension wire will not rub against the sides of the hole in the cover. Put the thermometer through another hole alongside the body. (3) Pinch the tube together, which connects the boiler to the calorimeter, but leave some opening in the boiler so that the steam may escape until needed. Put the delivery tube through the third hole in the cover so that its end reaches nearly to the bottom of the calorimeter but does not touch the suspended calorimetric body. Place a burner under the boiler, and when the steam is issuing freely, read the thermometer in the calorimeter to tenths of a degree, thus getting the lower temperature t of the calorimetric body. Open the pinch cock and close the other opening so as to make the steam pass into the calorimeter. (4) After steam has been passed into th...

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