Index of content:
Volume 14, Issue 3, March 1943
14(1943); http://dx.doi.org/10.1063/1.1770125View Description Hide Description
The properties of beryllium which make it the ideal choice of material for windows used in transmitting long wave‐length x‐rays are discussed. Diffraction x‐ray tubes of the permanently evacuated type using beryllium windows are described.
14(1943); http://dx.doi.org/10.1063/1.1770126View Description Hide Description
An improved integrator circuit for measuring the ion beam current used in nuclear research is described. A condenser is allowed to be charged and upon reaching a definite potential is discharged through a thyratron tube. This action is brought about at the proper point by a trip circuit composed of two pentode tubes. The potential between the thyratron cathode and the trip circuit is accurately controlled by a voltage regulator network. The action of the circuit proves to be quite linear over a wide range of currents and rates of operation.
14(1943); http://dx.doi.org/10.1063/1.1770127View Description Hide Description
A description is presented of the equipment for the measurement of the pulse size from Geiger‐Mueller counters, and the results are given for the gas mixtures 90 percent He 10 percent H2, 90 percent Ne 10 percent H2, 90 percent A 10 percent H2, 100 percent H2, and 90 percent A 10 percent O2 for pressures from 2 to 30 cm of mercury, and for a mixture of 9.7 cm of argon and 1.2 cm of ethyl alcohol.
- LABORATORY AND SHOP NOTES
14(1943); http://dx.doi.org/10.1063/1.1770129View Description Hide Description