A theoretically perfect fulcrum - that is, movement about an axis without friction -has been achieved in the TORSION Balance. By means of adjustable poise weight, the center of gravity of the balance is accurately positioned above the center of rotation. The position of the center of gravity determines the sensitivity of the balance. When inequality of weight is established in the two pans, the beam tips in the direction of the greater weight. The force of gravity always acts in a direction opposite to the torsional resistance. The action of the balance as it oscillates is limited to the slight torsional twist of taut metal bands. There is no friction here because there is no movement of one part over another. This operation is illustrated in Figures 1 and 2.

A balance using the TORSION principle is exceptionally quick acting and sensitive to the smallest differences in weight. Because of the one-piece nature of the construction and the absence of wear, once the balance is in adjustment, it remains so as long as it functions. Dusty and dirty atmospheres abrade and deteriorate the knife edges of a conventional balance and cause inaccuracies and loss of sensitivity. The TORSION balance has no such knife edge fulcrums; accordingly, dusty and dirty atmospheres have no effect on the operation or accuracy of the balance. It is this fact which has made the TORSION Balance ideal for both laboratory and industrial use. The accuracy and sensitivity of a TORSION Balance are permanent with its life limited only by the normal wear and tear to which any accurate instrument is subjected. The unique construction of a TORSION Balance results in a balance requiring practically no service.