. Laboratory exercises in elementary physics. nd (lb.), and theounce (oz.), one sixteenth of a pound. The pound is aweight equal to that of a piece of metal in the posses-sion of the government. The metric unit of weight isthe gram (g. or grm.), and is the weight of a cubic centi- DETERMINATION OF WEIGHT. 79 meter of water at a specified temperature. A larger unit,the kilogram (k.), is the weight of 1000 grams. Thegram is divided into decigrams (d. or dg.), .1 gram ; centi-grams (eg.), .01 gram ; milligrams (mg.), .001 gram. Largeweights are expressed in kilograms and decimals of a kilo-gram ;


. Laboratory exercises in elementary physics. nd (lb.), and theounce (oz.), one sixteenth of a pound. The pound is aweight equal to that of a piece of metal in the posses-sion of the government. The metric unit of weight isthe gram (g. or grm.), and is the weight of a cubic centi- DETERMINATION OF WEIGHT. 79 meter of water at a specified temperature. A larger unit,the kilogram (k.), is the weight of 1000 grams. Thegram is divided into decigrams (d. or dg.), .1 gram ; centi-grams (eg.), .01 gram ; milligrams (mg.), .001 gram. Largeweights are expressed in kilograms and decimals of a kilo-gram ; small weights in grams and decimals of a a general way, the kilogram, is used in place of the poundin English measure, and the gram in place of the ounce. The Balance.—This instrument is represented in Fig. is the support, BB the beam, and PP the pans. Beforeuse the beam should be level, and the bottoms of the pansabout half an inch from some surface underneath. The bodyto be weighed should be placed in the left-hand pan, and. weights in the right-hand pan, one by one, until the beamagain hangs level. Then the sum of the weights used isthe weight of the body. The weights used in laboratoriesare generally metric. The larger ones down to one gramare made of brass (Fig. 60), and their values are stampedon the top. Weights of less than one gram are made ofplatinum or aluminium. These have values stamped onthem in decimals of a gram.* For example, a weightmarked would be (one tenth) of a gram, or a deci- * Sometimes the smaller weights are made of wire. The numberof parts represented is indicated by bending the wire into a polygonof a corresponding number of sides. 80 MENSURATION. gram-; means two centigrams, etc. The larger weightsare kept in holes bored in a block of wood; the smallerare either in one hole provided with a cover, or in shallowholes covered by a glass plate. In case the smaller weights


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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectphysics