Bulletin of the Bureau of Standards, Volume 1U.S. Government Printing Office, 1905 - Physics Contains results of investigations, researches, etc., pertaining to scientific, technical and manufacturing interests of the country. |
From inside the book
Results 1-5 of 25
Page 24
... heated to 160 ° C. in an air bath , and , after having cooled in a desiccator for an hour or two , carefully weighed . After the experiment the deposits were washed four or five times with dis- tilled water , until the last wash water ...
... heated to 160 ° C. in an air bath , and , after having cooled in a desiccator for an hour or two , carefully weighed . After the experiment the deposits were washed four or five times with dis- tilled water , until the last wash water ...
Page 25
... heated in my experiments . The weighings were made with a good chemical balance , having a sensitiveness of about 20 divisions for the load used . It was found advisable to keep two shal- low dishes with calcium chlorid in the balance ...
... heated in my experiments . The weighings were made with a good chemical balance , having a sensitiveness of about 20 divisions for the load used . It was found advisable to keep two shal- low dishes with calcium chlorid in the balance ...
Page 63
... heated in a porcelain dish at 100 ° C. , with moderate stirring until the zinc has been fully dissolved in the mercury . 3. Preparation of the mercurous sulphate . - Take mercurous sulphate , purchased as pure ; mix with it a small ...
... heated in a porcelain dish at 100 ° C. , with moderate stirring until the zinc has been fully dissolved in the mercury . 3. Preparation of the mercurous sulphate . - Take mercurous sulphate , purchased as pure ; mix with it a small ...
Page 65
... heated in a porcelain dish , and some of the amalgam is drawn into the tube by means of the rubber bulb . The point is then quickly cleaned of dross with filter paper , and is passed through the wider tube to the bottom and emptied by ...
... heated in a porcelain dish , and some of the amalgam is drawn into the tube by means of the rubber bulb . The point is then quickly cleaned of dross with filter paper , and is passed through the wider tube to the bottom and emptied by ...
Page 77
... heated sufficiently to vaporize the contained metal , the spectrum of the lighter gas filling the tube disappears . Recently Professor Lewis has shown that when mercury vapor is present in a tube of hydrogen it will reduce the hydrogen ...
... heated sufficiently to vaporize the contained metal , the spectrum of the lighter gas filling the tube disappears . Recently Professor Lewis has shown that when mercury vapor is present in a tube of hydrogen it will reduce the hydrogen ...
Contents
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Common terms and phrases
absolute accuracy alternating current ampere anode black body bridge Bureau of Standards c. g. s. units calibration carbon cathode cent centimeters charge Chatelier Chronograph circuit Clark cell column commutator comparison condenser current constant coulometer Critical capacity deposit determined disk effect electrical units electrodes electromotive force energy equal equation error experiments Féry fibers frequency galvanometer give given glass harmonics heated hence hydrogen incandescent inductive coil instrument intensity curve Kurlbaum lamp light Lummer magnetic ments mercurous sulphate mercury metallic meter method microfarad mirrors nitrate observed obtained ohms optical pyrometer photometric Phys platinum Plücker pressure primary pure pyrom pyrometer radiation rheostat secondary spectra shown silver nitrate silver voltameter solution spectrum Table temperature thermometers tion tube vapor variations varied volt volts Wanner wave length Weights and Measures Weston cell Wien's Wien's law wire zinc sulphate
Popular passages
Page 53 - Ampere, which is one-tenth of the unit of current of the CGS system of electromagnetic units and which is represented sufficiently well for practical use by the unvarying current which, when passed through a solution of nitrate of silver in water, in accordance with a certain specification, deposits silver at the rate of 0.001118 of a gramme per second.
Page 366 - Custom-Houses, and for other purposes, to be delivered to the governor of each state in the Union, or such person as he may appoint, for the use of the states respectively, to the end that a uniform standard of weights and measures may be established throughout the United States.
Page 50 - As a unit of resistance, the international ohm, which is based upon the ohm equal to 10" units of resistance of the CGS system of electromagnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice, 14.4521 grams in mass, of a constant cross-sectional area and of the length of 106.3 centimetres.
Page 61 - ... international farad, which is the capacity of a condenser charged to a potential of one international volt by one international coulomb of electricity.
Page 66 - Now, therefore, Her Majesty, by virtue of the power vested in Her by the said Act, by and with the advice of Her Privy Council, is pleased to approve the several denominations of standards set forth in the schedule hereto, as new denominations of standards for electrical measurement.
Page 61 - ... the electro-motive force that, steadily applied to a conductor whose resistance is one international ohm, will produce a current of...
Page 74 - The International Ohm is the unit of resistance and is defined as the resistance offered to an unvarying current by a column of mercury at the temperature of melting ice, 14.4521 grams in mass, 106.300 cm.
Page 376 - In 1893, the international metre and kilogram became the fundamental standards of length and mass in the United States, both for metric and customary weights and measures.
Page 69 - Clean the glass tube and platinum wire carefully, then heat the exposed end of the platinum red-hot, and insert it in the mercury in the test tube, taking care that the whole of the exposed platinum is covered. Shake up the paste and introduce it without contact with the upper part of the walls of the test tube, filling the tube above the mercury to a depth of rather more than 1 cm.
Page 62 - The liquid should consist of a neutral solution of pure silver nitrate, containing about 15 parts by weight of the nitrate to 85 parts of water. The resistance of the voltameter changes...