New Catechism of Electricity: A Practical TreatiseT. Audel, 1896 - 541 стор. |
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Сторінка 30
... tube still acts as a magnet . Lucretious found a magnet put into a brass vase attracted iron filings through the brass . Gilbert surrounded a magnet by a ring of flames , and found it still to be subject to magnetic attraction from ...
... tube still acts as a magnet . Lucretious found a magnet put into a brass vase attracted iron filings through the brass . Gilbert surrounded a magnet by a ring of flames , and found it still to be subject to magnetic attraction from ...
Сторінка 91
... tube , and even a rod of wood stuck into the cork , possessed the power of attacking light bodies . He found , similarly , that metallic wire and pack - thread conducted electricity , while silk did not . Gray even succeeded in ...
... tube , and even a rod of wood stuck into the cork , possessed the power of attacking light bodies . He found , similarly , that metallic wire and pack - thread conducted electricity , while silk did not . Gray even succeeded in ...
Сторінка 360
... Tube Electric Lamps . - Partial vacuum tubes known as Geisler's and Crooke's have been in use for years as a source of light in which , as is generally known , the light is produced by the passage of the electric discharge through the ...
... Tube Electric Lamps . - Partial vacuum tubes known as Geisler's and Crooke's have been in use for years as a source of light in which , as is generally known , the light is produced by the passage of the electric discharge through the ...
Сторінка 361
... Tube is a glass tube containing two platinum wire terminals passing through the glass and having the air exhausted so as to leave a partial vacuum . Electric dis- charges or sparks pass between the two wires much more easily in a vacuum ...
... Tube is a glass tube containing two platinum wire terminals passing through the glass and having the air exhausted so as to leave a partial vacuum . Electric dis- charges or sparks pass between the two wires much more easily in a vacuum ...
Сторінка 381
... tube , slanting upward toward the inside . The tube must be sealed with tape , thoroughly painted , and securing the tube to the wire . b . Must be arranged to enter and leave the building through a double contact service switch , which ...
... tube , slanting upward toward the inside . The tube must be sealed with tape , thoroughly painted , and securing the tube to the wire . b . Must be arranged to enter and leave the building through a double contact service switch , which ...
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Загальні терміни та фрази
adjusted alternating current ammeter amperes apparatus arc light armature arranged 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 direct current direction disconnection drum electric current electric energy ELECTRIC LIGHTING ELECTRIC POWER TRANSMISSION ELECTRICAL RESISTANCE electro-magnet electromotive-force excessive exciting fault field coils field magnet fuse galvanometer hand regulator heat incandescent inch insulation iron lamps liable lines of force load machine magnetic field metal method motion motor NATIONAL BOARD FIRE needle parallel passing pipes placed plate points pole pieces position practical pressure produced pulley QUES resistance rheostat ring rotating RULES AND REQUIREMENTS screw segments shaft short circuit shown in Fig solder sparking speed surface switch telegraph telephone terminals tion tube vibration voltage voltmeter volts winding WIRING RULES wound zinc
Популярні уривки
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 iv - 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 iv - 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 523 - This manoeuvre should likewise be repeated at least sixteen times per minute. This serves the double purpose of freeing the throat so as to permit air to enter the lungs, and also, by exciting a reflex irritation from forcible contact of the under part of the tongue against the lower teeth, frequently stimulates an involuntary effort at respiration.
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 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 523 - ... and hold them there for two or three seconds only. (This is to expand the chest and favor the entrance of air into the lungs.) Then carry the arms down to the sides and front of the chest, firmly compressing the chest walls, and expel the air from the lungs. Repeat this maneuver at least sixteen times per minute.
Сторінка 521 - Rule (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 gloves are convenient. If the body is in contact with the earth, the...
Сторінка 389 - Must not be of such material or construction that the insulation of the conductdr 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 401 - All cut-outs and safety devices in place in the above. Where lamp sockets, receptacles and electroliers, etc., are connected, one-half of the above will be required.