A simple recording balance

Abstract

AbstractA recording balance, consisting of a simple analytical balance, an electronic part and a recorder, is described.In a normal balance any deflection causes a compensating force due to gravity.The present balance has been made mechanically indifferent and an electrical zero‐point has been introduced, which may be shifted at will. The compensating force (which is free from any gravity component at any deflection) is directed by the deflection of the balance with the aid of a simple electro‐optical system. The electrical system, which contains no servo‐motor, also provides damping. Equilibrium is attained without restoring the balance to an initial position.The sensivity of the balance may be changed easily from 25 mg to 200 mg full scale deflection of the recorder.The accuracy, which is mainly determined by the accuracy of the recorder, amounts to 0.3% of full scale deflection.The use of the present balance as a thermobalance is described.But for the recorder the apparatus is simple and inexpensive.