A Sensitive Direct Current Electrical Integrator

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Abstract
A permanent magnet-movable coil d.c. instrument mechanism is used as an oscillating relay for time integration of d.c. potential. It is operated in conjunction with an input-reversing relay and a vacuum tube circuit to promote oscillation, the frequency of which is proportional to the input potential, and the number of oscillations is related to the potential-time integral. In operation the accuracy of integration is within 1 percent over an input-level ratio of over 100. And the energy demand from the source of input is comparable or less than that required to operate conventional d.c. indicating instruments.
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