Volume 3, Issue 2, February 1932
Index of content:
3(1932); http://dx.doi.org/10.1063/1.1748906View Description Hide Description
3(1932); http://dx.doi.org/10.1063/1.1748907View Description Hide Description
A simple method of constructing delicate radiation thermocouples with gold leaf receivers is described in detail. A tellurium wire ¼ mm long could be easily welded to the receiver by using a condenser discharge. The thermoelectric power of tellurium in its β‐modification against bismuth is about 600 μv/°C. The thermocouples are about three times more sensitive than those made with bismuth alloy wires. Some methods for evacuating and permanently evacuating the thermocouples are given.
3(1932); http://dx.doi.org/10.1063/1.1748909View Description Hide Description
The increasing need for an extremely accurate stroboscope has been met by the Stroboglow. This instrument is a portable stroboscope, which gives excellent definition of the image at high speeds, and which may be accurately timed over a frequency range of 300 to 10,000 cycles per minute. At low frequencies, the instrument may be timed from the machine shaft, or by the electrical oscillator developed for this purpose. At high frequencies, the timing is accomplished by the oscillator, no connection to the machine being necessary.
3(1932); http://dx.doi.org/10.1063/1.1748904View Description Hide Description