The Principles and Practice of Electric Lighting

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Longmans, Green, 1884 - Electric lighting - 172 pages
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Page 169 - Trade, that the unit of price to be charged should be based on " the energy contained in a current of 1,000 amperes flowing under an electro-motive force of one volt during one hour " ; or, in other words, the unit might be put as 1,000 volt-ampere-hours.
Page 144 - Since the resistance of a conductor varies directly as its length and inversely as its area of cross section, we can readily compute the resistance of a wire when its length and diameter are given.
Page 26 - Therefore, if the controlling force under which a body vibrates is due to the action of an electro-magnet on its armature, the square of the number of vibrations in a given time is a measure of the square of the electric current.
Page 30 - The unit of work is the work done in raising a weight of one pound through a distance of one foot.
Page 18 - The areas of circles are proportional to the squares of their •diameters...
Page 30 - CGS unit of force is that force which acting on a gramme of matter for a second, generates a velocity of one centimetre a second. This unit is...
Page 3 - The whole system of modern electric illumination is dealt with in this volume. It gives a detailed description of all the principal modern generators and lamps, together with conductors and the other appliances required in electric light installations. It contains also a full account of the various Applications of Electric Lighting up to recent date. " The author has collected all the most recent available information concerning the process of manufacture, life, &c. , of arc and glow lamps in a very...
Page 42 - Figure 189, which shows the iron filings arranged along the lines of magnetic force. If a wire is forced through a magnetic field so as to cut the lines of magnetic force, a current is induced in the wire. Michael Faraday first discovered this fact, and it was one of the most important discoveries ever made by man. It enabled Faraday himself to make a machine that would generate electricity when it was whirled about, and from machines of this kind come nearly all the...
Page 31 - ... boiling water ; state and explain what will occur. 11. The inside of the wall of a house is at 15 C., and the outside at 0C., the wall is of stone, and 50 cm. thick. Find how much heat passes across it per square metre. The conductivity of the stone is -005 and the unit of heat is the quantity required to raise the temperature of one gramme of water one degree centigrade.

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