The hybrid balance uses a mix of mechanical and electronically generated forces, whereas the electromagnetic force balance uses electronically generated forces entirely. If one were to wander through the nation’s industrial facilities and laboratories, one would find electronic balances being used for everything from counting batches of resistors to adjusting the component ratio of epoxy mixtures. To overcome the difficulties of unequal arm lengths inherent with the two-pan equal-arm balance, Borda suggested a method known as substitution weighing to be used in place of transposition weighing. In 1886, a balance was designed and built specifically for substitution weighing, although the modern one-pan substitution balance did not become commonplace until the 1950s. In some instances, the balance may actually contain a single weight or a set of weights, or a weight may be supplied separately by the balance manufacturer for calibration of the balance.