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The design and performance of a low‐noise hydrophone preamplifier is described. Transistors are used throughout the circuit and it is shown that, although the noise figure is slightly worse than the equivalent circuit using vacuum tubes and transformers, in practice the over‐all performance...
This instrument was designed to measure and control the flux density between the poles of an iron‐core electromagnet used in conjunction with a beta‐ray spectrometer. A sensing coil, rotating at 1800 rpm, generates 0.115 v (rms) per gauss. A comparison signal, against which the emf of the...
A novel method is described for measuring specific volume of liquids at high temperatures and pressures. The displacement of the two ends of a continuous column of the liquid is measured. One end is maintained at high temperature and pressure while the other is at normal conditions.
The equipment and techniques used to grow 6‐in. diam silicon and germanium crystals are described, and the effect of spin, radiation, and mode of heating on crystal growth from a melt is discussed.
The design and operation of an adiabatic low‐temperature calorimeter employing a somewhat different design of automatic shield control is described. Thermocouple difference is sensed by a dc μv amplifier, which is followed in the circuit by a recorder‐controller and a Leeds & Northrup Series...
A nuclear magnetic resonance experiment which may be used to measure with high precision the average value of a magnetic field over an extended path in space is described. The nuclei, contained in a flowing liquid, are excited at one point and detected at another downstream from the point of...
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