. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. 188 BELL SYSTEM TECHNICAL JOURNAL Instead of using the constants tth and ttu it is customary to use a single constant C given by B = ijie - fJio = r = CT (103) where the constant C is called the relative stress optical constant and r the retardation. The dimensions of C are the reciprocal of a stress and are. Fig. 3—Photoelastic picture of a disk in compression. measured in cm- per dyne. A convenient unit for most purposes is one of 10~^'* cmVdyne; if this is used, the
. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. 188 BELL SYSTEM TECHNICAL JOURNAL Instead of using the constants tth and ttu it is customary to use a single constant C given by B = ijie - fJio = r = CT (103) where the constant C is called the relative stress optical constant and r the retardation. The dimensions of C are the reciprocal of a stress and are. Fig. 3—Photoelastic picture of a disk in compression. measured in cm- per dyne. A convenient unit for most purposes is one of 10~^'* cmVdyne; if this is used, the stress optical coefficients of most glasses are from 1 to 10 and most plastics are from 10 to 100. This unit so defined has been called the "Brewster". In terms of the Brewster, the retardation is r = CTd (104) If C is measured in Brewstcrs, (/ in millimeters and 7' in l)ars (10^ dynes/ cm'-) then r, as given by the formula, is expressed in angstrom units,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Telephone and Telegraph Company. [Short Hills, N. J. , etc. , American Telephone and Telegraph Co. ]
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
