. Carnegie Institution of Washington publication. THE CALORIMETER SYSTEM AND MEASUREMENT OF HEAT. 159 In weighing any suspended object, some up-and-down motion is of course necessary. If an equipoise were used, this motion would extend through several inches, but if a platform balance is used, it may be cut down to a small fraction of an inch. Moreover, a series of tests showed that if all lateral motion could be eliminated it was pos- sible to remove the hooks fastened to the under side of the platform and designed to prevent lateral motion and thus ma- terially increase the sensitiveness of
. Carnegie Institution of Washington publication. THE CALORIMETER SYSTEM AND MEASUREMENT OF HEAT. 159 In weighing any suspended object, some up-and-down motion is of course necessary. If an equipoise were used, this motion would extend through several inches, but if a platform balance is used, it may be cut down to a small fraction of an inch. Moreover, a series of tests showed that if all lateral motion could be eliminated it was pos- sible to remove the hooks fastened to the under side of the platform and designed to prevent lateral motion and thus ma- terially increase the sensitiveness of the balance. The balance in use is of the Fairbanks platform type, designated by the manu- facturers as a silk platform scale. It is graduated to 10 grams and has a capacity of 150 kg. It was put in place exactly over the opening through the floor down into the calorimeter, carefully leveled by placing thin strips of copper under each of the corners, and was rigidly fixed in this position. A hanger was constructed of half-inch pipe, and a quarter-inch rod attached to the lower part of the hanger extended through the opening into the calorimeter. On the lower end of this rod was attached a rubber stopper for closing the opening when the weighing is com- pleted, and a stout iron ring into which various supports for weighing the man and other objects could be hooked. The adjustment of the balance and this tube were such that the rod swung freely, and even with considerable vibration on the lower end would not touch the sides of the tube. The same conditions affecting the open- ing through the food aperture as regards necessity for preventing leakage of heat or air obtained in making this opening through the calorimeter chamber. The leakage of heat was prevented by using. FIG. 46.—Weighing Apparatus for Ob- jects Inside the Chamber. A chair is suspended on a rod extending from top of calorimeter chamber. A metal yoke is hung over the platform of bal- ance, so that chair and subje
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