Scientific Papers of the Bureau of Standards, Volume 17U.S. Government Printing Office, 1922 |
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absorption acid alloys ammonia annealed apparatus Average coefficients B. S. Bull B. S. Sci bath black body bolometer brass Bureau of Standards calibration capacity carbon cerium circuit coefficients of expansion coil cold-rolled computed condenser cooling copper curves D. C. WASHINGTON GOVERNMENT DEGREES CENTIGRADE determined diameter effect electric equation erbium erythrosin etching experimental filter fluorite fractions frequency gage galvanometer GOVERNMENT PRINTING OFFICE heating hot-rolled inch indicated inductance instantaneous coefficients lanthanum lines magnetic magneto maximum measurements metal method mica modulator nickel observed obtained oxide Phys picnometers plate platinum Probable error proustite quartz radio reagents receiver reflection factor refractive indices resistance resistance thermometer samarium samples SCIENTIFIC PAPERS sensitivity shown in Fig solution specimen spectrograms spectrum STANDARDS S. W. STRATTON steel stellite surface Table temperature thermocouple thermometer tion total radiation transmission tube voltage volts wave lengths winding wire yttrium
Popular passages
Page 92 - The conclusion to be drawn from these experiments would appear to be that the alterations which take place when hard copper is by annealing converted into the soft variety are unaccompanied by any change in linear dimensions. It is known that the separation of a constituent as of graphite from cast iron or pearlite from steel, is accompanied by marked dilatometric changes. Le Chatelier...
Page 112 - The plus ( + ) sign indicates an increase in length, and the minus ( — ) sign a decrease in length.
Page 676 - In carrying out the computations n' is calculated as the fraction part of the order by which any given ring differs from N. The formula for calculating this is given by Meggers...
Page 732 - In the case of single stars, at all temperatures, the spectral energy distribution is selective as compared with a black body. A calculation is made of the spectral component radiations of a black body at various temperatures, using the spectral transmission data on these screens. From a comparison of the observed and the calculated spectral radiation components it appears that the black body temperature...
Page 693 - ... subject to appreciable errors, methods which make use of the interference of light waves were used in making these measurements. With the interference methods described in this article the planeness and parallelism errors of precision surfaces can be measured, and the length of standard gages...
Page 726 - The other components indicate a spectral energy distribution similar to that of a black body at 3000 to 3300° K.
Page 719 - Bulletin, 11, p. 621; 1914. Scientific Papers of the Bureau of Standards, Vol. 17 FIG. I — Stellar thermocouple, T, in evacuated glass container A summary of the constants, including the radiation sensitivity, of the (freshly evacuated) thermocouples is given in Table 2. They are of interest in showing the uniformity of radiation sensitivity that may be expected in thermocouples constructed of the same material. The receivers were made 0.5 mm in diameter, which was larger than previously used,...
Page 346 - In one of his experiments a collodion dry plate which had been stained yellow with aniline red to prevent halation showed, in addition to its blue and violet sensitiveness, a sensitiveness in the green. This region of sensitiveness corresponded to an absorption band in the spectrum of aniline red. He had much difficulty in the sensitizing of his plates, often obtaining only one satisfactory plate out of six attempts. With gelatine dry plates even greater 1 Vogel, Handbucb der Photographic.
Page 196 - These wave-length comparisons were made by means of etalon interferometers and most of the values are probably correct to one part in several millions. The elegance and precision of the interferometer methods for wave-length comparisons are demonstrated by the close agreement between values obtained by different observers, and also by the constant frequency differences of many of the lines belonging to combination series. There are only a few cases where independent observers differ by 0.004 A or...
Page 101 - ... safe. But, as it did not yet come up entirely to the inventor's expectations, he proceeded to contrive a third lamp, in which he proposed to surround the oil vessel with a number of capillary tubes. Then it struck him that if he cut off the middle of the tubes, or made holes in metal plates, placed at a distance from each other equal to the length of the tubes, the air would get in better, and the effect in preventing the communication of explosion would be the same.