PREFACE In addition to the tests and comparisons made by the Bureau of Standards, its work includes such researches as are involved in the establishment and maintenance of the various standards and units of measurement, the development of measuring instruments and methods of measurement, the determination of physical constants, and the properties of materials. The results of these investigations are published in pamphlet form, and in the following pages is given a descriptive list of these papers. The papers are issued in five separate series (1) Scientific Papers, (2) Technologic Papers, (3) Circulars, (4) Handbooks, and (5) Miscellaneous Publications. They cover a wide range of subjects in the field of physical measurements and the properties of materials, and are issued for general distribution to the scientific, technical, and industrial interests concerned with the subjects treated. Series 1 and 2 may be subscribed for in advance by volume, addressing the Superintendent of Documents. The official distribution of a limited free edition includes single copies to the technical press, designated Government depository libraries, those collaborating with the bureau in its investigations, organizations exchanging like courtesies with the bureau, and certain specialists concerned with the subjects treated. Others, however, may purchase them from the Superintendent of Documents, Government Printing Office, Washington, D. C., at the prices stated. When applying to the Bureau of Standards for any of these publications, merely state the symbol and number preceding the title; when ordering from the Superintendent of Documents, give symbol and number of publication and name of bureau. This general circular will be revised from time to time. A supplement to this Circular brings the list up to date and contains a list of bureau publications not obtainable and which may be consulted at some designated Government depository library, and the publications that have been delivered since this Circular was issued. The supplement contains an index which, with the index to the main Circular, affords a complete topical reference to the published work of the Bureau of Standards. (2) PUBLICATIONS OF THE BUREAU OF STANDARDS 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. Č., 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.] 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. (5) |