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An instrument is described which will detect and record the alpha‐disintegration rate of prepared radioactive samples even though soft beta‐radiation up to 5×10 9 disintegrations per minute may also be present. The counting losses arising from the detector, electronic amplifier, scaler, and...
It is shown how punched‐card‐relay calculators can be used for solving ordinary linear differential equations of sixth and lower order. The differential equations are replaced by difference equations which can be solved by the relay calculators automatically step by step. The final solution...
Gas samples of a few micron liters can be analyzed to within a few percent accuracy with the described system. Identification of components is made from condensation points, comparison readings of Pirani and McLeod gauges, and differences in speeds of flow. Condensation points at sub‐liquid...
An electronic instrument is described which will weigh small objects with precision comparable to that of the chemical beam balance. It is a direct‐reading instrument of the null‐balance type, and is faster to use and requires less skill on the part of the operator than does the mechanical...
A grounded grid oscillator and a single dee resonant system for use with a frequency modulated cyclotron are described. 7.5‐Mev deuterons have been accelerated with dee voltages up to 15 kv and a frequency range from 9.5 to 12 megacycles. 15‐Mev protons have been accelerated with voltages up...
A method is described of producing metallic replicas from gratings by electro‐deposition of copper. It is possible to obtain concave replicas from a convex original grating—either metallic or glass. The optical figure and the grating qualities of the replicas are tested and shown in Figs. 2...
A method has been developed for determining absolute numbers of neutrons in terms of helium production in the B( n, α)Li reaction. We are able to report preliminary measurements of the number of neutrons emitted per second from a certain Ra+Be source; i.e., source called No. 38, which contains...
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