## Wire in Electrical Construction |

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Page 36

Tests for ductility will be made as follows : The

two vises , 6 inches apart , and twisted . The full number of twists must be

distinctly visible between the vises on the 6 - inch

a

Tests for ductility will be made as follows : The

**piece**of wire will be gripped bytwo vises , 6 inches apart , and twisted . The full number of twists must be

distinctly visible between the vises on the 6 - inch

**piece**. The number of twists ina

**piece**of ... Page 37

Samples taken from

bar 27 inches in diameter without any signs appearing of the zinc cracking or

peeling off ; the 600 - Ib , wire shall similarly bear bending around a bar 274

inches ...

Samples taken from

**pieces**of the 800 - ib . wire shall also bear bending around abar 27 inches in diameter without any signs appearing of the zinc cracking or

peeling off ; the 600 - Ib , wire shall similarly bear bending around a bar 274

inches ...

Page 47

85 , the weight of a

This makes S equal 5 195 . Looking at the table of values of S , page 50 , this

value for a span of 130 feet comes between a deflection of . 003 and . 004 .

85 , the weight of a

**piece**of copper one foot long and one square inch in section .This makes S equal 5 195 . Looking at the table of values of S , page 50 , this

value for a span of 130 feet comes between a deflection of . 003 and . 004 .

Page 58

... is a much more valuable aid in detecting a poor

an insulation lower than the average shows a local defect , which , in time , will

be likely to cause trouble . CRESCENT RUBBER WIRE Stranded conductors .

... is a much more valuable aid in detecting a poor

**piece**of wire , as in this casean insulation lower than the average shows a local defect , which , in time , will

be likely to cause trouble . CRESCENT RUBBER WIRE Stranded conductors .

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### Common terms and phrases

according Areas average avoirdupois B. A. units Bismuth bond braid Breaking weight cable calculated capacity carry cent CENTERS Centigrade centimeters centum circuit Circular mils common conductor consist COPPER WIRE core cotton covered Cubic diameter double drawn EFFECTS electrical electro-motive force equal Fahrenheit feet Fluid ounce foot formed formulæ gauge given grams hard holes insulation international ampere International ohms Iron Joule Kilograms kilometer kind laid Legal ohms length less liquid loose Maximum MEASURES mercury metallic mile Names of units Numbers of wires ordinary Ounces passed piece Platinum pounds per square practical prepared pure represented Required resistance RESULTING rubber saturated Sharpe silver sizes soft copper solid solution span Spans in feet SPECIFIC GRAVITIES square inch Square meters Square millimeters standard Steel strain strand strength taken TELEGRAPH temperature tests thickness tional ohms twists units voltameter watt Weatherproof Weights per mile yards

### 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.