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New developments in an eddy current type flaw detector are discussed. Several types of pick‐up units, which contain the exciting coils for inducing eddy currents in the test material and pick‐up coils for detecting changes in this eddy current pattern when a flaw is approached, are described....
A new x‐ray tube for diffraction analysis has been produced which affords much greater x‐ray beam intensity than has been possible with previous designs. In addition the purity of the x‐ray spectrum is insured. The new tube employs thin sheets of malleable beryllium, produced by additions...
X‐ray studies have been made of a number of carbon blacks, prepared under different conditions, and subject to various heat treatments. The patterns were made in evacuated cameras, using Cu K α radiation monochromated by reflection from rocksalt. The patterns consist of crystalline reflections...
A machine is described which has been used for determining the vibration properties of various types of rubber mountings used for the isolation of mechanical vibrations. The vibrations are excited by oppositely rotating eccentric weights and are recorded on a tape. It was found that resonance...
The rapid heating and cooling cycle of the focal area of a high speed radiographic x‐ray tube anode results in short life, although maximum temperatures produced are not excessive. Some objections are found to earlier theoretical investigations of temperature distributions beneath such focal...
Formulas are derived for the vector potential and inductance of a circuit comprised of a long linear cylinder enveloped by a return conductor of eccentric‐annular cross section, the two cylinders and the surrounding medium each being of different permeability. The restriction to very long...
It is shown that high voltage surges are produced in apparatus associated with gas discharge devices when, and only when, the demand for current exceeds the current‐carrying capacity of the gas (or vapor). Cathode spot extinction and sputtering of hot cathodes cause only slight disturbances...
THE application of the viscosity concept to this technically important field is presented. Discussed first is film lubrication which occurs when the film thickness is greater than 10 −5 cm. This mechanism is chiefly controlled by the viscosity η of the liquid. The basic mathematical theory is...
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