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A tensile testing instrument of the soft type which has been specifically designed to facilitate accurate axial alignment of submicron whiskers or filaments is described. The load is applied by a dead‐weight loading mechanism similar to that used in chain balances and strain is measured...
Power transistors delivering 8‐A pulses of 2‐msec width are used to drive low impedance coils in Ross and Barksdale valves. Unijunction transistors and Thyristors are used to replace all relays and lamp flasher elements in compact, reliable alarm units of new design. Life tests equivalent to...
The vertical and radial betatron oscillation frequencies have been measured on the UCLA 50‐MeV spiral‐ridge cyclotron. The technique used was that of rf knockout, in which the internal beam was passed through a pair of exciter plates which provided an rf electric field. When the frequency was...
A system is described which provides a triggering signal for a scintillation or spark chamber from a coincidence circuit. Power is supplied to label the recording film with a register number and to advance the film to a clear position. Multiple exposures of events are prevented.
The intensity and decay time of Po 210 alpha particle scintillations produced in pure and thallium‐activated cesium iodide have been measured with a fast electronic system as a function of temperature down to 77°K. Three modes of decay due to alpha excitation have been observed for CsI(Tl),...
The apparatus described in this paper can be used to grow alkali halide single crystals of several hundred grams from the melt in less than 48 h per crystal. The growth is carried out in a cylindrical quartz enclosure in a selected gas atmosphere which is maintained at a slight positive pressure...
The focusing properties of a quadrupole lens pair have been studied under conditions to produce a wedge‐shaped ion beam for a mass spectrometer. The lens equations have been analyzed numerically and resulting graphs are given for the determination of various lens parameters.
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