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 36
Page 25
... cell , St. C. , were placed , the latter so as to oppose the potential difference at the termi- nals of the standard resistance ; equality between the two is indicated by the galvanometer remaining at rest . An unsaturated Weston cell ...
... cell , St. C. , were placed , the latter so as to oppose the potential difference at the termi- nals of the standard resistance ; equality between the two is indicated by the galvanometer remaining at rest . An unsaturated Weston cell ...
Page 27
... cell was not placed directly in the shunt from the standard resistance , but a potentiometer was intro- duced , the Weston cell balanced over a resistance of 10,190 ohms and then the terminal potential difference of the standard ...
... cell was not placed directly in the shunt from the standard resistance , but a potentiometer was intro- duced , the Weston cell balanced over a resistance of 10,190 ohms and then the terminal potential difference of the standard ...
Page 34
... cell at 15 ° C. is 1.434 volts . The unsaturated Weston cell was found to have an E. M. F. of 1.01954 volts . The resistance standards have been repeatedly intercompared with those of the Reichsanstalt . In Table 10 the amount of silver ...
... cell at 15 ° C. is 1.434 volts . The unsaturated Weston cell was found to have an E. M. F. of 1.01954 volts . The resistance standards have been repeatedly intercompared with those of the Reichsanstalt . In Table 10 the amount of silver ...
Page 35
... cell is given for the different forms . TABLE 10 . Current . Richards type . Richards type ( modified ) . Large anode type . Usual type . Amperes . Grams . Grams . Grams . Grams . 0.5 4.09881 4.09888 4. 10154 0.5 4.09906 4.09896 4.09891 ...
... cell is given for the different forms . TABLE 10 . Current . Richards type . Richards type ( modified ) . Large anode type . Usual type . Amperes . Grams . Grams . Grams . Grams . 0.5 4.09881 4.09888 4. 10154 0.5 4.09906 4.09896 4.09891 ...
Page 36
... cell and the electrochemical equivalent of silver reduced to the same value for the E. M. F. of the Clark cell would give 1.11726 mg . In the following table we find a comparison of the values obtained by different observers , all being ...
... cell and the electrochemical equivalent of silver reduced to the same value for the E. M. F. of the Clark cell would give 1.11726 mg . In the following table we find a comparison of the values obtained by different observers , all being ...
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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...