A simple recording electromagnetic weighing balance has been constructed and operated as a moisture sorption balance and as a flash pyrolysis weight-loss balance. A weight hanging at one end of a lever arm is equilibrated by the counter torque resulting from an armature (same axis of rotation as the lever arm) carrying an electric currentflowing perpendicular to a magnetic field. The current is supplied from a dc amplifier which is controlled by light falling on a phototube. These components are interconnected in a feedback loop so that the weight of the sample,the amount of light striking the phototube, and the magnitude of the counter torque current are all sustained in dynamic equilibrium. The instrument has been operated over the 0- to 100-mg range and found to be linear and quite stable with a precision of 0.04 mg.
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K. A. Lincoln (1960) studied this question.
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