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A circuit is described which is operated by the cardiac action current impulses in which the reading of a meter is a nearly linear function of the pulse rate. The impulses are amplified and applied to a trigger tube which sets off a gas discharge tube discharging a condenser at each beat. The...
Mechanical means are described whereby types of equations may be graphically represented and non‐linear simultaneous equations may be solved. The procedure requires, in each case, that the equation be changed to a trigonometric form by polar transformation. Graphs are shown to illustrate the...
A method of continuously measuring the level of conducting and non‐conducting liquids has been developed. The liquid to be measured occupies the inner space of a coaxial cylindrical condenser. As the level of liquid varies, the capacitance varies. The change in capacitance detunes a resonance...
Guard electrodes are useful devices which enable accurate dielectric measurements to be made on small samples of insulating material. They are generally applied to the electrode system of the material for the measurements of: (1) insulation resistance; (2) dielectric constant; (3) power factor....
A powder camera is described which was designed for the purpose of taking x‐ray photographs through an x‐ray diffraction angle of 0°—45° in a cylindrical camera of 57.3‐mm radius, to temperatures greater than 300°C. The essential features are (1) a concentric heater extending above and...
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