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A versatile high‐gain dc amplifier for biological applications is described. Its features include differential push‐pull operation with a rejection ratio greater than 1000; response from zero to beyond 30 kc with a maximum gain of about 2.5×10 6 ; optional control of high‐ and...
Using a glass resin kettle as enclosure, and an inverted‐ J electrode, a small arc‐melting furnace was designed for conveniently melting metals under an inert atmosphere.
A small automatic furnace has been designed for the study of the thermal decomposition of wood and other combustible materials. After a sample has been brought nearly to thermal equilibrium at any desired temperature, the furnace temperature control system is automatically changed to allow the...
Two ion sources have been developed for the production of milliamperes of N + , N 2+ , N 3+ , and N 4+ ions. Under good operating conditions, 28 ma of N 3+ and 10 ma of N 4+ are produced. Details of source construction are given and a method for analyzing the source output is presented....
A method is given for correcting the measured Hall voltage for shorting by the current contacts and for inhomogeneities in the applied magnetic field. This method is applied to measurements of the Hall coefficient in gold‐silver alloys.
An electron‐diffraction unit incorporating a rotating sector has been developed which makes possible the accurate and objective measurement of the intensity of electrons diffracted by free atoms and molecules. The diffraction data afforded are sufficiently precise to permit the calculation of...
A means of accurately and rapidly measuring the radii of curvature of many cloud‐chamber tracks is described. The apparatus includes a photographing‐reprojecting system and a curvature‐measuring device. This device is capable of measuring radii of reprojected tracks in the range from 0.5 cm...
The full energy spread‐out bremsstrahlung beam of the Berkeley synchrotron was shown to be emitted in sharp bursts with the 47.7‐Mc∕sec frequency of the electrons in the doughnut. A two‐counter telescope, located about 20 inches away from a one‐fourth inch thick lead target and about 20...
The mechanical design features and operating characteristics of a hot‐cathode arc‐discharge type ion source are described. Proton currents of 500 milliamperes have been obtained under dc test conditions. A maximum current of 3 milliamperes of 22‐Mev protons has been obtained with the source...
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