The Book of Household Management by Mrs. Beeton

weighing-machines for family use. These are found to have existed among the ancients, and must, at a very early age, have been both publicly and privately employed for the regulation of quantities. The modern English weights were adjusted by the 27th chapter of Magna Charta, or the great charter forced, by the barons, from King John at Runnymede, in Surrey. Therein it is declared that the weights, all over England, shall be the same, although for different commodities there were two different kinds, Troy and Avoirdupois. The origin of both is taken from a grain of wheat gathered in the middle of an ear. The standard of measures was originally kept at Winchester, and by a law of King Edgar was ordained to be observed throughout the kingdom. [Illustration: _Fig_. 19.] [Illustration: _Fig_. 20.] Fig. 19 is an ancient pair of common scales, with two basins and a movable weight, which is made in the form of a head, covered with the pileus, because Mercury had the weights and measures under his superintendence. It is engraved on a stone in the gallery of Florence. Fig. 20 represents a modern weighing-machine, of great convenience, and generally in use in those establishments where a great deal of cooking is carried on.