New Catechism of Electricity: A Practical TreatiseT. Audel, 1896 - 541 стор. |
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Сторінка 32
... ; but , if a South pole is presented to another South pole or a North pole to a North pole , they will repel each other , and there will be no attraction . MAGNETISM AND MAGNETS . Strength of a Magnet . - 32 NEW CATECHISM OF ELECTRICITY .
... ; but , if a South pole is presented to another South pole or a North pole to a North pole , they will repel each other , and there will be no attraction . MAGNETISM AND MAGNETS . Strength of a Magnet . - 32 NEW CATECHISM OF ELECTRICITY .
Сторінка 33
... strength of a magnet is the strength of its poles . The strength of a magnet pole must be measured by the magnetic force which it exerts . The lifting power of a magnet depends both upon the form of the magnet and on its magnetic ...
... strength of a magnet is the strength of its poles . The strength of a magnet pole must be measured by the magnetic force which it exerts . The lifting power of a magnet depends both upon the form of the magnet and on its magnetic ...
Сторінка 40
... strength of an electro - magnet depends directly on the number of turns of wire and the current flowing through them . In an electro - magnet with an iron core , the grade of the iron also affects the strength - the best soft Swedish ...
... strength of an electro - magnet depends directly on the number of turns of wire and the current flowing through them . In an electro - magnet with an iron core , the grade of the iron also affects the strength - the best soft Swedish ...
Сторінка 70
... strength of the currents depends on the resistance of the conductors in the circuit , as well as on the electromotive - force , all unnecessary resistance should be avoided . ( 12. ) Approach being a finite process , the method of ...
... strength of the currents depends on the resistance of the conductors in the circuit , as well as on the electromotive - force , all unnecessary resistance should be avoided . ( 12. ) Approach being a finite process , the method of ...
Сторінка 77
... strength of the magnetic field of a solenoid is at every point proportional to the strength of the electric current passing through its coils ; if the current is increased , the magnetism is increased in proportion also ; and if the ...
... strength of the magnetic field of a solenoid is at every point proportional to the strength of the electric current passing through its coils ; if the current is increased , the magnetism is increased in proportion also ; and if the ...
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Загальні терміни та фрази
adjusted alternating current ammeter amperes apparatus arc light armature arranged AUDEL bars battery bearings belt BOARD FIRE UNDERWRITERS boiler brushes carbon cause cell commutator conducting conductors connected construction copper core COUPLING OF DYNAMOS current flowing current of electricity cut-out device direct current direction disconnection drum electric current electric energy ELECTRIC LIGHTING ELECTRIC POWER TRANSMISSION ELECTRICAL RESISTANCE electro-magnet electromotive-force engine exciting fault field coils field magnet fuse galvanometer hand regulator heat incandescent inches insulation iron lamps liable lines of force load machine magnetic field mechanical metal method motor NATIONAL BOARD FIRE needle operation parallel passing pipes placed plate points pole pieces position practical pressure produced pulley Pumps QUES resistance rheostat ring rotating screw segments shaft short circuit shown in Fig solder sparking speed steam surface switch telegraph telephone terminals tion tube voltage voltmeter volts winding WIRING RULES wound zinc
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Сторінка 396 - Must be so suspended that the entire weight of the socket and lamp will be borne by knots under the bushing in the socket, and above the point where the cord comes through the ceiling block or rosette, in order that the strain may be taken from the joints and binding screws.
Сторінка v - The vital knowledge— that by which we have grown as a nation to what we are, and which now underlies our whole existence, is a knowledge that has got itself taught in nooks and corners; while the ordained agencies for teaching have been mumbling little else but dead formulas.
Сторінка 386 - 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 404 - 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...
Сторінка 388 - ... the wires ; that is, in a two-wire system the two wires, and in a three-wire system the three wires, must be protected by the cut-out and disconnected by the operation of the switch or circuit breaker.
Сторінка 386 - 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 v - That which our school courses leave almost entirely out, we thus find to be that which most nearly concerns the business of life. All our industries would cease, were it not for that information which men begin to acquire as they best may after their education is said to be finished.
Сторінка 2 - This volume gives the latest and most helpful information respecting the construction, care, management and uses of Gas, Gasoline and Oil Engines, Marine Motors and Automobile Engines, including chapters on Producer Gas Plants and the Alcohol Motor. The book is a practical educator from cover to cover and is worth many times its price to any one using these motive powers.
Сторінка 523 - Repeat this maneuver at least sixteen times per minute. These efforts should be continued unremittingly for at least an hour, or until natural respiration is established. 3. At the same time that this is being done, some one should grasp the tongue of the subject with a handkerchief or piece of cloth to prevent it slipping, and draw it forcibly out when the arms are extended above the head, and allow it to recede when the chest is compressed. This maneuver should likewise be repeated at least sixteen...
Сторінка 521 - When an accident occurs, the following rules should be promptly executed with care and deliberation: 1. Remove the body at once from the circuit by breaking contact with the conductors. This may be accomplished by using a dry stick of wood, which is a nonconductor, to roll the body over to one side, or to brush aside a wire, if that is conveying the current. When a stick is not at hand, any dry piece of clothing may be utilized to protect the hand in seizing the body of the victim, unless rubber...