4. ORDERING Any of the publications herein, with the exception of those listed under "Publications Not Available" in the accompanying supplement may be obtained from the Superintendent of Documents, Government Printing Office, Washington, D. C., at the price indicated. Purchase orders with remittance should be sent to the Superintendent of Documents. (Do not send any such orders or remittances to the Bureau of Standards.) Remittance should be made in the form of money order, check, or cash, and is at sender's risk. Order by serial initial letter and number combined (for example, "Bureau of Standards publication T281'). If initial and number are correctly given, the title is not needed. All publications are sent out by the Superintendent of Documents, as provided by law, and usually reach destination within a week or two. 5. BOUND VOLUMES In addition to the separate papers, both the Scientific and Technologic series are also issued in bound form of about 750 pages for each volume, consecutively paged, including title-page and index. Subscription for either series may be placed in advance with the Superintendent of Documents, Government Printing Office, Washington, D. C., to receive the separates as issued at $1.25 per volume (unbound), and $2 for each volume bound in cloth. See price list below. The Scientific Papers may be obtained in bound form from Volume 1 to 19. (Previous to Volume 15 they were called Reprints and in the bound form were known as the "Bulletin.") Plan (d) is especially recommended. The Technologic Papers in the bound form begin with Volume 16, Technologic Paper No. 203. Previous to this they had only been issued as separates. Plan (g) is especially recommended. 6. PRICE LIST AND SUBSCRIPTION BASIS Per volume (a) Bulletins of the Bureau of Standards, vols. 1-14, inclusive; 1904-1914 (cloth)..... $2.00 (b) Series (a) continued-Scientific Papers of the Bureau of Standards, vol. 15 on (cloth)... 2.00 (c) Unbound separates, preprints of (b), sent as issued.. (d) Combination of (c) and (b)................... 1.25 3.25 (e) Technologic Papers of the Bureau of Standards, beginning with vol. 16 (cloth). (f) Unbound separates of Technologic Papers sent as issued... 2.00 1.25 SCIENTIFIC PAPERS [For publications in the following list that are out of print or procurable only from Superintendent of Documents, Government Printing Office, Washington, D. C., see the supplement to this Circular.] SI. Recomparison of the United States Prototype Meter.. .L. A. Fischer An account of a comparison made between the United States Meter No. 27 and the standards of the International Bureau of Weights and Measures, giving the observations in detail, and a description of the method of comparison and the apparatus. (June 15, 1904.) 15 pp. Price, 5 cents. S2. A Study of the Silver Voltameter ..K. E. Guthe A description of the various forms of silver voltameters that have been used for measuring the unit of electric current and a comparison of the results obtained by them, including especially the comparison of the filterpaper type with the porous-cup type. (Sept. 1, 1904.) 17 pp. [Superseded by S194, S195, S201, S220, S240, S271, S283, S285.1 S3. The So-called International Electrical Units. .Frank A. Wolff A paper presented to the St. Louis International Congress on the redefinition of the fundamental units, with a historical review and an appendix on laws concerning electrical units adopted by this and foreign governments. (July 1, 1904.) 38 pp. (See also S102.) [Superseded by Circular No. 60.] S4. The Spectra of Mixed Gases... P. G. Nutting It is shown that in spectra of electrically conducting mixtures of gases, other things being equal, the spectrum of the gas of highest atomic weight will be brightest. (July 15, 1904.) 5 pp. Price, 5 cents. S5. On Secondary Spectra and the Conditions under which they may be Produced.... ...P. G. Nutting A determination of what elements give two different spectra and the conditions of excitation necessary for the production of each. (July 15, 1904.) II pp. Price, 15 cents. S6. Some New Rectifying Effects in Conducting Gases.. ..P. G. Nutting When electrodes differ in size, form, temperature, material, condition of surface, nature, and density of surrounding gas, the current tends to pass more easily in one direction than in the reverse, thus giving an excess of current in one direction. (July 15, 1904.) 6 pp. Price, 5 cents. S7. On Fibers Resembling Fused Quartz in Their Elastic Properties... ..K. E. Guthe Owing to the difficulty of obtaining fibers of fused quartz of sufficient strength to carry a load of 500 g and at the same time to have a small elastic fatigue, experiments were made to find a substitute. It was found that fibers of steatite could be easily drawn and possessed the desired properties. (Sept. 1, 1904.) 7 pp. Price, 10 cents. S8. On the Temperature of the Arc.. .C. W. Waidner and G. K. Burgess Estimation of the black-body temperature of positive crater with Le Chatelier, Wanner, and Holborn-Kurlbaum optical pyrometers; variation of temperature with current; review of previous work. Measurements based on Wien-Planck equation for monochromatic radiation. (Sept. 1, 1904.) 16 pp. Price, 5 cents. S9. The Absolute Measurement of Inductance. ....E. B. Rosa and F. W. Grover The inductances of some standards are measured by the impedance method (using alternating current) in terms of resistance and the frequency of the current. The wave form of the current used is accurately determined and analyzed, and a correction applied for the harmonics present. (Oct. 15, 1904.) 28 pp. Price, 10 cents. SIO. The Absolute Measurement of Capacity. . . .E. B. Rosa and F. W. Grover The capacity of standard mica condensers is measured by the Maxwell bridge, in terms of resistance and time. Sources of error are carefully investigated, and results of measurements on a number of condensers given. (Nov. 1, 1904.) 35 Pp. Price, 15 cents. SII. Optical Pyrometry........C. W. Waidner and G. K. Burgess Review of the laws of radiation and their application to the measurement of high temperatures. Experimental investigation of various types of optical and radiation pyrometers as to methods of calibration, sources of error, order of accuracy, and necessary precautions. Applications to the radiation from platinum and other substances. (Sept. 15, 1904.) 61 pp. Price, 10 cents. S12. On the Theory of the Matthews and the Russell Léonard Photometers for the Measurement Edward P. Hyde The accuracy of these instruments in measuring lamps with various simple polar distribution curves is investigated. The method is given for computing the best arrangement of any given number of mirrors to obtain relative values between lamps having different distribution curves. (Oct. 1, 1904.) 21 pp. S13. The Testing of Clinical Thermometers.. ..C. W. Waidner and L. A. Fischer Description of apparatus and methods used in the testing of clinical thermometers. Specifications governing tests. (Nov. 1, 1905.) 15 pp. Price, 15 cents. S14. Measurement of Inductance by Anderson's Method, using Alternating Currents and a Vibration Galvanometer.... ...E. B. Rosa and F. W. Grover This method gives inductance in terms of capacity and resistance. The theory of the method is fully worked out and formulæ derived for the corrections depending on the residual capacities and inductances of the arms of the bridge. Results show that high accuracy is possible. A very convenient and reliable method for a wide range of inductances. (Aug. 15, 1905.) 44 pp. Price, 15 cents. S15. Use of Serpentine in Standards of Inductance.... ....E. B. Rosa and F. W. Grover Serpentine spools are shown to be unsuitable for standards of inductance, as the serpentine is slightly magnetic and its permeability variable. Hence the inductance of the coil depends to some extent on how much current is passing through the coil when it is in use. Marble is nonmagnetic and therefore better. Mahogany spools saturated with paraffin are quite satis S16. The Silver Coulometer ...K. E. Guthe A critical comparison of different forms of silver coulometer (or voltameter) with an account of some new work with various types and a discussion of the values that have been obtained for the electrochemical equivalent of silver. [Superseded by S285.] (Sept. 1, 1905.) 16 pp. S17. History of the Standard Weights and Measures of the United States.. .L. A. Fischer A brief description of the standards of length and mass accepted at different periods by the United States Government. (June 30, 1905.) 17 pp. Price, 10 cents. S18. Wattmeter Methods of Measuring Power Expended upon Condensers and Circuits of Low Power Factor..... ..Edward B. Rosa The power expended upon a condenser may be measured by a wattmeter, but owing to the small power factor of the current accurate measurements are difficult. Several new null methods are given which permit sensitive instruments to be used and accurate results obtained. (Sept. 1, 1905.) 15 Pp. Price, 10 cents. S19. The Relative Intensities of Metal and Gas Spectra from Electrically Conducting Gases. . . .P. G. Nutting A study of the conditions which determine whether the spectrum of the electrodes shall be brighter or fainter than the spectrum of the surrounding gas. (Aug. 1, 1905.) 18 pp. S20. The Use of White Walls in a Photometric Laboratory.. ...Edward P. Hyde If proper black velvet screens are employed on a photometer bench, the leakage of light into the photometer, due to the diffuse reflection from white walls, is shown to be so small as to be negligible. (July 15, 1905.) 4 pp. Price, 5 cents. S21. Influence of Wave Form on the Rate of Integrating ....E. B. Rosa, M. G. Lloyd, and C. E. Reid Experiments on integrating wattmeters show a variation in the rate with changes in the frequency and wave form of the current. (Aug. 15, 1905.) 14 PP. Price, io cents. S22. Detector for Small Alternating Currents and Electrical Waves... ...L. W. Austin An investigation of the rectifying effects obtained when using copper electrodes in a solution of copper sulphate. (Aug. 1, 1905.) 4 pp. Price, 5 cents. S23. The Positive Charges Carried by the Canal Rays.. .L. W. Austin An experimental demonstration of the positive charges carried by the canal rays. (Aug. 15, 1905.) 3 pp. Price, 5 cents. S24. Radiation from Platinum at High Temperatures.. .G. K. Burgess On a linear relation between the true temperature and the black-body temperature of a radiating substance. (Aug. 15, 1905.) 3 Pp. Price, 5 cents. S25. A Five-Thousand Volt Generator Set.......P. G. Nutting A description of a set of 10 small generators giving a direct current of 0.2 ampere at 5000 volts. (Sept. 15, 1905.) 3 pp. Price, 5 cents. S26. Talbot's Law as Applied to the Rotating Sectored The apparent intensity of a source, before which a sectored disk is rotating rapidly, is found to be proportional to the total angular opening of the sectored disk for all angles between 288° and 10°. (Mar. 1, 1906.) 32 pp. Price, 15 cents. S27. A New Determination of the Electromotive Force of Weston and Clark Standard Cells by an Absolute Electrodynamometer.... ...K. E. Guthe An account of the construction and determination of the constant of a Gray absolute electrodynamometer and work done with the same in determining the absolute value of the electromotive force of standard cells, assuming the international ohm. (Later determinations of values for electrical standards are given in C6o. See also S171.) (Jan. 15, 1906.) 38 pp. Price, 5 cents. S28. The Gray Absolute Electrodynamometer...Edward B. Rosa A discussion of the theory of the instrument, showing the order of magnitude of certain possible errors and how the dimensions should be taken to conform to the conditions assumed in the formula for the dynamometer. (Jan. 30, 1906.) 16 pp. Price, 5 cents. S29. Construction and Calculation of Absolute Standards of Inductance.... .J. G. Coffin A description of two standards of self-inductance and the calculation of their inductance. Two formulas for the calculation of their self-inductances are derived, and several other formulas for the calculation of inductances are given. (Feb. 1, 1906.) 57 pp. Price, 10 cents. S30. An Efficiency Meter for Electric Incandescent Lamps. ....E. P. Hyde and H. B. Brooks By means of a variable resistance in series with the voltage circuit of a wattmeter and controlled by the position of the photometer screen the wattmeter is made to indicate watts per candle directly. (Mar. 15, 1906.) 16 pp. Price, 10 cents. $31. Calculation of the Self-Inductance of Single-Layer Coils.... .....Edward B. Rosa Single layer cylindrical coils are the best form of absolute self-inductances to construct and measure, but the formulas used in their calculation all assume that the current flows in a continuous sheet over the cylindrical surface. In this paper formulas are derived and tables given for calculating two correction terms to be applied to the results obtained from the current sheet formulæ to give the true self-inductance of an actual coil. (Mar. 15, 1906.) 29 pp. Price, 10 cents. S32. Heat Treatment of High-Temperature Mercurial .Hobert C. Dickinson Review of previous work. Results of annealing thermometers of different kinds of glass at various temperatures for long periods. Suggestions concerning the proper heat treatment of thermometers, electric annealing furnaces, and the pointing of thermometers to read true gas-scale temperatures. (Apr. 15, 1906.) 36 pp. Price, 10 cents. S33. A New Potentiometer for the Measurement of Con Electromotive Force and Current. . . . . . .H. B. Brooks Theory and design of a new instrument for accurate measurements. sists of a potentiometer with one dial, on which the larger part of the quantity is read off, the remainder being shown by the deflection of a pivoted galvanometer. [Superseded by S172 and S173.] (Mar. 30, 1906.) |