What people are saying - Write a review
We haven't found any reviews in the usual places.
Other editions - View all
action alternating currents amperes arc lamps arc light armature arrangement attracted battery Bunsen burning candle-power candles carbon points cell central station conductor connection constructed continuous current copper current passes current strength diameter difference of potential differential lamps disc distance dynamo Edison effect efficiency electric light electro-magnet electromotive force elements employed engine expense filament fixed galvanometer glow lamps Gramme machine heat horizontal horse-power illuminating power incandescent increase installation instrument insulated intensity internal resistance iron core Joule's law latter length of arc lower carbon machine magnet main circuit main current means measured mechanical mechanical efficiency ment metallic metres millimetres motion movable normal length number of lamps obtained Ohm's law ohms parallel photometer placed pole position revolutions per minute screw short-circuited Siemens solenoid standard candle temperature terminals tion total resistance traversed tube upper carbon upper carbon-holder volts wheel whilst windings wire coils
Page 135 - as a part of the circuit tends to magnify every other source of difficulty and danger. The chief element of safety is the employment of skilled and experienced electricians to supervise the work. I. THE DYNAMO MACHINE. 1. The dynamo machine should be fixed in a dry place. 2. It should not be exposed to dust or flyings. 3. It should be kept perfectly clean and its bearings well oiled. 4. The insulation of its coils and conductors should be perfect 5.
Page 376 - THE With an Account of the Regimen of the Missouri River and a Description of the Methods used for Founding in that River. By O. Chanute, Chief Engineer, and George Morrison, Assistant Engineer. Illustrated with 5 lithographic views and 12 plates of plans. 4to, cloth $6.00 KAPP, GISBERT, CE Electric Transmission of Energy and its Transformation, Subdivision, and Distribution.
Page 137 - The escape of electricity cannot be detected by the sense of smell, as can gas, but it can be detected by apparatus far more certain and delicate. Leakage not only means waste, but in the presence of moisture it means destruction of the conductor and its insulating covering, by electric action.
Page 136 - Where bare wire out of doors rests on insulating supports it should be coated with insulating material, such as india-rubber tape or tube, for at least two feet on each side of the support. 12. Bare wires passing over the tops of houses should never be less than seven feet clear of any part of the roof, and they should invariably be high enough, when crossing thoroughfares, to allow fire escapes to pass under them.
Page 134 - The difficulties that beset the electrical engineer are chiefly internal and invisible, and they can only be effectually guarded against by "testing" or probing with electric currents. They depend chiefly on leakage, undue resistance in the conductor, and bad joints, which lead to waste of energy and the production of heat.
Page 136 - All wires used for indoor purposes should be efficiently insulated, either by being covered throughout with some insulating medium, or, if bare, by resting on insulated supports. 13. When these wires pass through roofs, floors, walls, or partitions, or where they cross or are liable to touch metallic masses, like iron girders or pipes, they should be thoroughly protected...