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In a simple direct current feed‐back amplifying circuit it is necessary to readjust the input grid bias each time the amplification is changed. A modified circuit is described whereby this difficulty of operation is eliminated.
A method of measuring capacitance and inductance is described, in which the product LC is found in terms of frequency by adjusting a circuit which contains the capacitance and an inductance to resonance, the ratio L/C is found in terms of resistance by a high frequency bridge, and the value of C...
An eliminator for full‐wave rectification (600 v) or half‐wave rectification (1200 v) with adjustable taps for all intermediate voltages, while introducing no new principle, gives a desirable flexibility for laboratory purposes. Ripple voltage, determined by the Bedell‐Reich Stabilized...
With the recent advances in photoelectric cell technique a number of experimenters have endeavored to devise a method of using vacuum tube amplification for the measurement of weak currents and small emf's. Among these may be mentioned Wynn‐Williams 1 and Eglin 2 who have developed a balanced...
One stage of amplification included in the stabilizing circuit of the Bedell‐Reich oscilloscope, which comprises a cathode‐ray tube with linear time‐axis for observation of periodically varying quantities, extends the frequency range of the instrument and permits stabilization without...
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