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A mechanical recorder is described having a resolving time of 0.8×10 −3 sec. It will follow regularly spaced pulses at the rate of 1200 per sec. and should miss no more than one percent of pulses spaced random in time at an average counting rate of 10 per sec. A circuit is also described...
A portable sensitive differential manometer is described. The instrument consists essentially of a train of gears from a small jeweled wrist watch movement and a drum covered with a rubber diaphragm. The design is such as to permit the measurement of rapid and slight variations of pressure. The...
Constructional details are given of a complete Geiger‐Müller counting system consisting of a stabilized high voltage supply, Neher‐Harper coupling circuit and vacuum‐tube scale‐of‐eight feeding a Cenco counter stage. The system is entirely a.c. operated. Its resolution time of 6.5×10...
Following A. G. Worthing the spectral emissive power may be obtained from measurements of the reflection coefficient. This method is applicable to the oxide‐coated filament both at room temperature and at normal operating temperatures. For a particular type of filament containing dispersed...
Voltage stabilizing circuits employing thermionic tubes can be classified into four groups, according to their derivation from (1) the transconductance bridge, (2) the amplification factor bridge, (3) the simple degenerative amplifier, and (4) combination circuits involving two or more of the...
A beat‐frequency oscillator is described which has a frequency range from 5 kilocycles to 1600 kilocycles, and a maximum power output of ten watts. Broad‐band amplifier principles are utilized in the design to obtain an output voltage substantially independent of frequency throughout the...
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