1. An arrangement and construction of moving parts in reciprocating or rotating machines to reduce dynamic forces which may result in undesirable vibrations.
2. A balance in which the sample weight is determined by comparison with a calibrated weight.

The mechanical balance consists, essentially, of a rigid beam that oscillates on a horizontal central knife-edge as a fulcrum and has the two end knife-edges parallel and equidistant from the center. The loads to be weighed are supported on pans hung from bearings.