Electric Lighting: A Practical Exposition of the Art, for the Use of Engineers, Students, and Others Interested in the Installation Or Operation of Electrical Plants, Том 2D. Van Nostrand Company, 1901 |
З цієї книги
Результати 6-10 із 89
Сторінка 26
... groups have been used directly on the ordinary series arc- lighting circuits ( constant current ) , like the series incandescent lamps described on page 24. The former arrangement is even 26 ELECTRI ELECTRIC LIGHTING .
... groups have been used directly on the ordinary series arc- lighting circuits ( constant current ) , like the series incandescent lamps described on page 24. The former arrangement is even 26 ELECTRI ELECTRIC LIGHTING .
Сторінка 27
... former arrangement is even less practical than the latter , and is also inferior to the " muni- cipal " system , since a lamp which breaks or burns out cannot be either short - circuited or compensated for by adding a lamp in the ...
... former arrangement is even less practical than the latter , and is also inferior to the " muni- cipal " system , since a lamp which breaks or burns out cannot be either short - circuited or compensated for by adding a lamp in the ...
Сторінка 33
... former case . This is easily seen , when it is considered that the mains in Fig . 16 , on each side of the feeding - point , are one - half as long , and carry about one - half as much current , as those in Fig . 13 , consequently the ...
... former case . This is easily seen , when it is considered that the mains in Fig . 16 , on each side of the feeding - point , are one - half as long , and carry about one - half as much current , as those in Fig . 13 , consequently the ...
Сторінка 34
... former are supplied through the portions of the main conductors which carry heavy currents , and in which the drop is greatest . For example , the drop on the mains in the case of the central group of lamps is 21.5 + 1.5 +27 volts , but ...
... former are supplied through the portions of the main conductors which carry heavy currents , and in which the drop is greatest . For example , the drop on the mains in the case of the central group of lamps is 21.5 + 1.5 +27 volts , but ...
Сторінка 44
... former ; since it is not a true cone , the diameter at the middle section being .707 in- stead of half that at the base , as already explained on page 32 . Such a conductor might also be considered as a wedge , two of the sides of which ...
... former ; since it is not a true cone , the diameter at the middle section being .707 in- stead of half that at the base , as already explained on page 32 . Such a conductor might also be considered as a wedge , two of the sides of which ...
Інші видання - Показати все
Electric Lighting: A Practical Exposition of the Art, for the Use of ... Francis Bacon Crocker Попередній перегляд недоступний - 2016 |
Загальні терміни та фрази
alternating current amperes apparatus arc lamps armature arrangement bulb bus bars cable candle-power capacity carbon cent circular mils conductors conduit connected constant current constant potential copper loss core cross-arm cross-section cut-out device diameter difference direct current distribution drop dynamo effect efficiency electric lighting electrical conductors employed energy equal fact feeders feeding-points filament flow frequency full load fuse globe ground heat hence incandescent lamps inch inclosed arc increase inductance insulation iron joint latter length less machines magnetic maximum mechanical metal meter method motor number of lamps ohms one-half open arc operation ordinary parallel phase pipe placed pole polyphase porcelain practically pressure primary produced reactance regulation represented in Fig resistance rheostat rotary rotary converters secondary circuit shown in Fig shunt side single-phase socket supplied switch temperature terminal three-phase three-wire system tion transformers tube two-phase two-wire two-wire circuit usually voltage volts wattmeter watts winding
Популярні уривки
Сторінка 460 - The lower limit is specified for rubber-covered wires to prevent gradual deterioration of the high insulations by the heat of the wires, but not from fear of igniting the insulation. The question of drop is not taken into consideration in the above tables.
Сторінка 11 - W, we find that the most economical area of conductor is that for which the annual cost of energy wasted is equal to the annual interest on that portion of the capital outlay which can be considered to be proportional to the weight of metal used. Professor George Forbes, in his Cantor Lecture, on " The Distribution of Electricity...
Сторінка 459 - 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.