AVOIRDUPOIS AND TROY WEIGHTS. 245. The unit of weight is the Gramme. In these weights there are six multiples of the base unit and three sub-multiples. The multiples of the base unit are, decagramme, hectogramme, myriagramme, quintal, millier, or ton neau. The sub-multiples of the base unit are decigramme, centigramme, milligramme. The lowest of these denominations is the Milligramme, and the highest, millier, or Toneau. 246. The scale is uniform, being ten. 247. To find the numerical value of the gramme in ounces Avoirdupois. Explanation.-a. By the definition, the gramme equals in weight one-millionth of a cubic metre of rain water. b. A cubic metre contains 35.314454 cubic feet. c. A cubic foot of rain water weighs 1000 ounces Av. Hence, a cubic metre weighs 35314.454 ounces Av., or а gramme weighs .035 oz. Av. 248. To express Avoirdupois weight in terms of the Metric System. Explanation. — This being the reverse of 247, find an equivalent value in ounces avoirdupois. Then find an equivalent value in grammes. NOTE.-The above equivalents are never given in exact values. Only approximate values are possible in most cases. 250. Addition of Compound Numbers. In adding compound numbers we must observe how many units of the denomination added make one unit of the next higher denomination. (1.) £ 8. d. far. From 22 19 23 251. Subtraction of Compound Numbers. In subtracting one compound number from another we must observe how many units make one unit of the next higher denomination. In this respect alone subtraction in compound numbers differs from subtraction in simple numbers 252. Multiplication of Compound Numbers. In multiplying, as in adding or subtracting compound numbers, we must observe how many units of the denomination multiplied, make one unit of the next higher denomination. In this respect alone multiplication in compound numbers differs from multiplication in simple numbers. |