Wire in Electrical Construction |
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Page 14
In employing the silver voltameter to measure currents of about one ampere , the
following arrangements should be adopted : The kathode on which the silver is to
be deposited should take the form of a platinum bowl not less than 10 ...
In employing the silver voltameter to measure currents of about one ampere , the
following arrangements should be adopted : The kathode on which the silver is to
be deposited should take the form of a platinum bowl not less than 10 ...
Page 15
The total metallic resistance of the circuit should not be less than 10 ohms . 2 . A
committee , consisting of Messrs . Helmholtz , Ayrton and CarTheir report has not
yet been received . 1 . 000 001 6161 . 000 001 598 Mil JOHN A . ROEBLING ' S ...
The total metallic resistance of the circuit should not be less than 10 ohms . 2 . A
committee , consisting of Messrs . Helmholtz , Ayrton and CarTheir report has not
yet been received . 1 . 000 001 6161 . 000 001 598 Mil JOHN A . ROEBLING ' S ...
Page 16
In many cases the nearest whole number of pounds is taken when the variation is
less than that found in actual weights of drawn wire . In computing the weights ,
the specific gravity of copper is taken at 8 . 89 , water being at its greatest density
...
In many cases the nearest whole number of pounds is taken when the variation is
less than that found in actual weights of drawn wire . In computing the weights ,
the specific gravity of copper is taken at 8 . 89 , water being at its greatest density
...
Page 36
Great tensile strength is not required , but the wire must not break under a less
strain than two and onehalf times its weight in pounds per mile . “ 3 . Tests for
ductility will be made as follows : The piece of wire will be gripped by two vises , 6
...
Great tensile strength is not required , but the wire must not break under a less
strain than two and onehalf times its weight in pounds per mile . “ 3 . Tests for
ductility will be made as follows : The piece of wire will be gripped by two vises , 6
...
Page 37
Not less than 237 767 247 214 186 800 600 571 450 833 629 477 424 213 204
176 166 118 2 480 1 860 1 390 1 240 620 2 550 1910 1 425 1 270 638 2 620 1
960 1 460 1 300 655 424 377 190 6 . 66 8 . 88 11 . 84 13 . 32 26 . 61 176 19 400
...
Not less than 237 767 247 214 186 800 600 571 450 833 629 477 424 213 204
176 166 118 2 480 1 860 1 390 1 240 620 2 550 1910 1 425 1 270 638 2 620 1
960 1 460 1 300 655 424 377 190 6 . 66 8 . 88 11 . 84 13 . 32 26 . 61 176 19 400
...
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Common terms and phrases
according actual allowed ampere average bond braid Breaking weight British cable calculated capacity carry cent Centigrade centimeters centum Circular mils colors composed computed conductor consist COPPER WIRE core cotton covered Cubic deflection diameters Diameters in mils double drawn EFFECTS electrical equal Fahrenheit feet foot formed formulæ gauge given gives grams hard head holes inches in diameter insulation INSULATION RESISTANCE International ohms Iron Kilograms kind laid Lead length less Magnet wire manufacture material Maximum MEASURES mercury meters MICHIGAN millimeters Names Numbers of wires Office wire ordinary piece pounds per square practical pure Required resistance rise rubber saturated Sharpe silver sizes soft solid solution span Spans in feet specifications square inch standard steel strain strand strength taken TELEGRAPH TELEPHONE temperature terminals tests thickness thimble tional ohms twists units various Weatherproof Weights per mile wrapped zinc
Popular passages
Page 14 - 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 crosssectional area and of the length of 106.3 cmsAmpere.
Page 15 - As a unit of quantity, the international coulomb, which is the quantity of electricity transferred by a current of one international ampere in one second. As a unit of capacity, the international farad, which is the capacity of a condenser charged to a potential of one international volt by one international coulomb of electricity. As a unit of work, the joule, which is equal to 10...
Page 14 - As a unit of current, the international ampere, which is onetenth 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, and in accordance with accompanying specifications deposits silver at the rate of Q.001118 of a gram per second.
Page 15 - 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 somewhat as the current passes. To prevent these changes having too great an effect on the current, some resistance besides that of the voltameter should be inserted in the circuit.
Page 15 - ... As a unit of electromotive force, the international volt, which is the electromotive force that, steadily applied to a conductor whose resistance is one international ohm, will produce a current of one international ampere, and which is represented sufficiently well for practical use by \\\% of the electromotive force between the poles or electrodes of the voltaic cell known as Clark's cell, at a temperature of 15° C., and prepared in the manner described in the accompanying specification...
Page 36 - Ibs. each. 7. The wire must be well galvanized and capable of standing the following test : The wire will be plunged into a saturated solution of sulphate of copper, and permitted to remain one minute, and then wiped clean. This process will be performed four times. If the wire appears black after the fourth immersion, it shows that the...
Page 15 - IOT units of work in the cgs system, and which is represented sufficiently well for practical use by the energy expended in one second by an international ampere in an international ohm. " As a unit of power, the watt, which is equal to 10...
Page 15 - As a unit of electromotive force, the international volt, which is the electromotive force that, steadily applied to a conductor whose resistance is one international ohm, will produce a current of one international ampere, and which is represented sufficiently well for practical use by ^2.
Page 14 - In the following specification the term silver voltameter means the arrangement of apparatus by means of which an electric current is passed through a solution of nitrate of silver in water. The silver voltameter measures the total electrical quantity which has passed during the time of the experiment, and by noting this time the time average of the current, or, if the current has been kept constant, the current itself can be deduced.
Page 15 - Henry, which is the induction in a circuit when the electro-motive force induced in this circuit is one international volt while the inducing current varies at the rate of one Ampere per second.
Bibliographic information
| Title | Wire in Electrical Construction Nineteenth Century Collections Online (NCCO): Science, Technology, and Medicine: 1780-1925 |
| Author | John A. Roebling's Sons Company |
| Publisher | Brandt Press, 1897 |
| Original from | the University of Michigan |
| Digitized | 25 May 2007 |
| Length | 73 pages |
| Export Citation | BiBTeX EndNote RefMan |