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A new and relatively simple type of mass spectrometer ion detector is described. The positive ion is accelerated onto an aluminum surface releasing secondary electrons, and these in turn are accelerated onto an organic scintillator, viewed by a sealed‐off photomultiplier. Counting methods are...
This paper presents the details of circuitry and construction for a direct reading resistance thermometer which has been built utilizing the design criteria formulated in Part I. By using any standard 25.5Ω platinum resistance thermometer as a sensing element, the bridge gives subdivision of the...
A new system for control of the x‐ray energy from a 25‐Mev betatron is described. Modifications in the method of energy control and orbit expansion lead to improved operation. Calibration of the energy scale is based on reaction thresholds for D(γ,n), Bi 209 (γ,n), Cu 63 (γ,n), and the...
A special thermocouple was developed to measure transient temperatures at relatively large distances within the walls of uncooled rocket nozzles. The device, known as a thermoplug, was designed to cause a minimum disturbance of the temperature field. Results of limited experiments indicate the...
Piezoresistivity, the change in resistivity with applied stress, offers a tool for analyzing the conduction mechanism in semiconductors and also offers potential transducer applications. A discussion of this effect in semiconductors and an analysis of the fourth‐rank piezoresistive tensor for...
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