Electric Wiring for the Use of Architects, Underwriters, and the Owners of BuildingsMacmillan and Company, 1896 - 183 стор. |
З цієї книги
Результати 1-5 із 25
Сторінка 5
... flows freely in space , and to conduct it we surround a certain amount of space with metal we use a pipe . The metal is ... flow in , and if these " holes " are not surrounded by ence . some non - conductor it is of course impossible to ...
... flows freely in space , and to conduct it we surround a certain amount of space with metal we use a pipe . The metal is ... flow in , and if these " holes " are not surrounded by ence . some non - conductor it is of course impossible to ...
Сторінка 9
... flow of something mate- rial . It is not known that anything material actually passes through a wire , but it is known that there is a progressive effect alor g it as if there were a " current " of something , and that this effect is ...
... flow of something mate- rial . It is not known that anything material actually passes through a wire , but it is known that there is a progressive effect alor g it as if there were a " current " of something , and that this effect is ...
Сторінка 14
... flow in a wire , and that if we make the wire smaller it takes more force to send the same current through it . We know , too , that if the heat generated is measured it is found to be equal to the energy expended . By making the wire ...
... flow in a wire , and that if we make the wire smaller it takes more force to send the same current through it . We know , too , that if the heat generated is measured it is found to be equal to the energy expended . By making the wire ...
Сторінка 30
... flow of the water , and a part of the energy is transformed into the work done by the wheel . The water falls to the next wheel where it has a diminished head , but the same in pro- portion to the number of wheels it has yet to FIG . 3 ...
... flow of the water , and a part of the energy is transformed into the work done by the wheel . The water falls to the next wheel where it has a diminished head , but the same in pro- portion to the number of wheels it has yet to FIG . 3 ...
Сторінка 31
... flow would continue through the by - passage . passage round the wheel could be made to offer exactly the same resistance that the wheel did , and in that case the pump could keep on developing the same pressure as before , and the ...
... flow would continue through the by - passage . passage round the wheel could be made to offer exactly the same resistance that the wheel did , and in that case the pump could keep on developing the same pressure as before , and the ...
Інші видання - Показати все
Electric Wiring for the Use of Architects, Underwriters, and the Owners of ... Russell Robb Попередній перегляд недоступний - 2016 |
Загальні терміни та фрази
air-space alternating currents ampères approved arc lamp attached batteries become break building burn by-path carbons carrying capacity cause combustible material concealed conductors conduit connection construction copper copper wire cross-connection cuit current passes damp danger devices double-pole ductors dynamo earth elec electric circuit electrical pressure electro-motive force energy excessive current exposed fastened fire fixture floor flow fuse fusible cut-out gas-pipe glass or porcelain globe ground hanger-board heat high-potential incandescent lamps inch inflammable inflammable material Inigo Jones installed insulating covering Insulating-joints leak leakage liable light lightning-arrester low-potential mains melt metal moisture motor multiple system multiple-series necessary neutral wire Ohm's law operated path pipe placed possible potential prevent protected resistance-box rheostat Rule 18 Section series circuit service-switch short circuit shown in Figure socket soldered space switch switch-board temperature tion transformer trical tube underwriters volts W. J. LOFTIE walls waterproof wires leading
Популярні уривки
Сторінка 127 - Definitions). b. Must be placed at every point where a change is made in the size of the wire (unless the cut-out in the larger wire will protect the smaller).
Сторінка 140 - No combination fixture in which the conductors are concealed in a space less than one-fourth inch between the inside pipe and the outside casing, will be approved. h. Each fixture must be tested for "contacts...
Сторінка 64 - Special attention is called to the fact that switchboards should not be built down to the floor, nor up to the ceiling, but a space of at least ten or twelve inches should be left between the floor and the board, and from eighteen to twenty-four inches between the ceiling and the board, in order to prevent fire from communicating from the switchboard to the floor or ceiling and also to prevent the forming of a partially concealed space very...
Сторінка 121 - ... b. Must not be placed in the immediate vicinity of easily ignitible stuff or where exposed to inflammable gases or dust or to flyings of combustible material.
Сторінка 112 - Must be so placed in wet places that an air space will be left between conductors and pipes in crossing, and the former must be run in such a way that they cannot come in contact with the pipe accidentally. Wires should be run over, rather than under, pipes upon which moisture is likely to gather or which, by leaking, might cause trouble on a circuit.
Сторінка 123 - Must not be of such material or construction that the insulation of the conductor will ultimately be injured or destroyed by the elements of the composition. c. Must be first installed as a complete conduit system, without conductors, strings, or anything for the purpose of drawing in the conductors, and the conductors then to be pushed or fished in. The conductors must not be placed in position until all mechanical work on the building has been, as far as possible, completed. d. Must not be so placed...
Сторінка 162 - Must be capable of being disconnected at the power plant, or of being divided into sections, so that in case of fire on the railway route, the current may be shut off from the particular section and not interfere with the work of the firemen. This rule also applies to feeders.
Сторінка 112 - Must be so spliced or joined as to be both mechanically and electrically secure without solder. The joints must then be soldered, to insure preservation, and covered with an insulation equal to that on the conductors.
Сторінка 139 - Must be entirely made of material that will resist the action of illuminating gases and will not give way or soften under the heat of an ordinary gas flame or leak under a moderate pressure.