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By use of the method of Betz and Karrer the cathode drop of an arc has been measured for a number of electrodes, including copper, silver, iron and arc welding electrodes with and without coatings. The time for an arc to establish the cathode drop voltage measured from the time the ``last''...
To learn more about the identification of crystalline materials, preferred orientations, particle sizes, strains, and structure randomness, x‐ray diffraction is used. Here both basic principles and working techniques are described.
The author's general theory is applied to the calculation of the settlement through consolidation of a soil loaded uniformly on an infinite strip of constant width with particular reference to the nature of the settlement at the edge of the loaded area. The solution is obtained by first...
A fast moving electron strikes a target—an x‐ray is born. This paper leads one from this simple fact to the most advanced sealed‐off tubes with air or liquid cooling, rotating targets, as well as demountable tubes of both vacuum and gas‐filled types.
Data are presented showing flow and physical properties of cellulose acetate plastics made using five plasticizers (previously described by Kirkpatrick before the Society of Rheology) with cellulose acetates of 2.3 and 2.6 acetyl groups per C 6 unit. Single plasticizers exert specific effects on...
The reaction of hydrogen selenide and pigment zinc oxide at room temperature has been investigated, using electron and x‐ray diffraction as a means of examining the reaction product. It was found that hydrogen selenide reacts with zinc oxide to form zinc selenide as a coating around the zinc...
Radiography, fluoroscopy, and therapy are medical terms that the x‐ray specialist knows. Here the equipment and the techniques of present‐day practice are described. The importance of physical instruments in advancing the art are made evident.
Constitution diagrams give in a small amount of space a great deal of information—the solid solutions and components present in an alloy—the ranges of temperature and compositions over which they are stable—information of very practical value to the metallurgist. The part played by x‐rays...
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