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It is widely recognized that the zero stability of dc amplifiers for measuring currents in the micro‐micro‐ampere region can be enhanced by the application of negative feed‐back. The promised advantages are often not fulfilled, however; and a design approach which emphasizes the economic...
A combination cloud chamber and ionization chamber in which the gas (argon at 51 lb in. −2 saturated with iso‐amyl alcohol) is common to both chambers is described. The ion chamber, a 3¾in. diameter brass cylinder 8 in. in length open at both ends and having a −in 1 16 − in . central...
The recent development of the bonded resistance wire strain gauge has led to its use as a device for measuring physiological pressure phenomena. Further application of the strain gauge has been as an instrument for measuring intravascular blood pressures and other pressure phenomena in biology...
A continuous flow, tube viscosimeter is described which permits determination of viscosities and gel strengths of abrasive thixotropic fluids at temperatures up to 250°F. Provision is made for the introduction of treating chemicals into the closed system, while under pressure, without...
Two calorimeters for the determination of the heat capacity of solid materials and heats of fusion are described. Typical data for potassium nitrate and for a solution of nicotinic acid in sulfuric acid are presented.
A new phase‐sensitive detector circuit has been developed having unusually high balance stability. Its inherently fixed balance should make it useful in the many types of servo circuits which utilize phase detected error signals. It has been found to be particularly useful in nuclear resonance...
Physiological applications and technical limitations of the RCA 5734 mechano‐electronic transducer tube are discussed. A variable protecting mount adapts this tube to full‐scale ranges of force from 5 g to 2.5 kg or more with a 5 volt swing on all ranges. Fundamental resonance frequency...
A simple exposure meter has been developed which measures directly the beam current reaching the fluorescent viewing screen of the electron microscope. By its use, the characteristic curve of a Kodak lantern slide plate has been plotted at constant intensity of electron beam. The value of beam...
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