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Some precautions necessary for accurate measurements of volume with the McLeod gauge are discussed, particularly the necessity of determining the capillary depression from each set of readings. Applications to the determination of small quantities of helium are given.
An artificial neutron source has been built which is very stable in operation and flexible in use. Using the D—D reaction, target currents of more than 200 microamperes at 300 kv give a neutron yield of 10 grams radium‐beryllium equivalent. It has been found that voltage stability at these...
A comparison has been made between three methods, given in the title, for the detection of weak x‐rays. The secondary electron multiplier tube has a lower resolving time than the Geiger‐Mueller tube, but the G‐M tube is from 5 to 10 times as sensitive to x‐rays of the wave‐lengths here...
An apparatus is described by means of which the speed of a sector disk or other reasonably light equipment of similar nature may be accurately controlled and the speed read directly from a set of dials.
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