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. |
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Results 1-5 of 41
Page 77
... 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 spectrum to about half its original intensity when but one ...
... 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 spectrum to about half its original intensity when but one ...
Page 78
... spectrum of a mixture of gases , other things being equal , the spectrum of the gas of greater atomic weight will be brighter . This applies to such simple , moderate , fairly homogeneous excitation as we have in a Plücker tube ...
... spectrum of a mixture of gases , other things being equal , the spectrum of the gas of greater atomic weight will be brighter . This applies to such simple , moderate , fairly homogeneous excitation as we have in a Plücker tube ...
Page 79
... spectrum of the former strongly , while a small percentage of helium in argon showed but a faint helium spectrum . Chemical combination occurs in the vast majority of cases , but com- pound spectra occur only in the case of a few ...
... spectrum of the former strongly , while a small percentage of helium in argon showed but a faint helium spectrum . Chemical combination occurs in the vast majority of cases , but com- pound spectra occur only in the case of a few ...
Page 80
... spectrum . The halogen spectrum remains visible as well as the mercury , evidently in proportion to the atomic weights of these sub- stances , but the compound spectrum is brighter than either , possibly in proportion to the molecular ...
... spectrum . The halogen spectrum remains visible as well as the mercury , evidently in proportion to the atomic weights of these sub- stances , but the compound spectrum is brighter than either , possibly in proportion to the molecular ...
Page 81
... spectrum is most favorable . If , however , it is desired to detect a small amount of a light gas mixed with a heavier , it is best to work with secondary spectra . In conclusion it may be well to call attention to the simple explana ...
... spectrum is most favorable . If , however , it is desired to detect a small amount of a light gas mixed with a heavier , it is best to work with secondary spectra . In conclusion it may be well to call attention to the simple explana ...
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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...