Electrical railroading; or, Electricity as applied to railroad transportation

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Сторінка 141 - Must be connected with a thoroughly good and permanent ground connection by metallic strips or wires having a conductivity not less than that of a No. 6 B. & S. copper wire, which must be run as nearly in a straight line as possible from the arresters to the earth connection. Ground wires for lightning arresters must not be attached to gas-pipes within the buildings. It is often desirable to introduce a choke coil in circuit between the arresters and the dynamo. In no case should the ground wire...
Сторінка 928 - Automobile Hand-Book." This book has been written with the intention of furnishing practical information regarding gas, gasoline and kerosene engines, for the use of owners, operators and others who may be interested in their construction, operation and management. In treating the various subjects it has been the endeavor to avoid all technical matter as far as possible, and to present the information given in a clear and practical manner.
Сторінка 140 - a. Must be attached to each side of every overhead circuit connected with the station. It is recommended to all electric light and power companies that arresters be connected at intervals over systems in such numbers and so located as to prevent ordinary discharges entering (over the wires) buildings connected to the lines.
Сторінка 336 - MASS AND WEIGHT.— The mass of a body is the quantity of matter in it ; the weight of a body is due to the force of gravity acting upon this matter. Since the force of gravity diminishes as we ascend from the...
Сторінка 90 - Place a hard roll of clothing beneath the body, with the shoulders declining slightly over it. Open the mouth, pull the tongue forward, and with a cloth wipe out Saliva or mucus. Thoroughly loosen the clothing from the neck to the waist, but do not leave the subject's body exposed, for it is essential to keep the body warm; kneel astride the subject's hips, with your hands well opened upon his chest, thumbs pointing toward each other and resting on the lower end of the breastbone ; little fingers...
Сторінка 72 - When this negatively-charged front sector arrives at a point opposite n3 it acts inductively on the back sector which is being touched by n3; hence this back sector will in turn acquire a positive charge, which it will carry over to the left. In this way all the sectors will become more and more highly charged, the front sectors carrying over negative charges from left to right, and the back sectors carrying over positive charges from right to left. At the lower half of the diagram a similar but...
Сторінка 260 - ... plates. Contraction and expansion of the active material may take place in normal working, and are increased by excessive rates or limits of charging and discharging. This constitutes another cause of disintegration, particularly in plates of the Faure type containing plugs or pellets of lead paste. The fragments which fall from the plates not only involve a loss of material, but are also likely to extend across or gather between the plates, and cause a short circuit. The positive plates are...
Сторінка 926 - ... succeeding pages, will be able to gain a thorough knowledge of the construction, maintenance and operation of all types of engines. Breakdown, and what to do in cases of emergency, are given a conspicuous place in the book, including engine running and all its varied details. Particular attention is also paid to the air brake, including all new and improved devices for the safe handling of trains. The book contains over 800 pages and is beautifully illustrated with line drawings and half-tone...
Сторінка 286 - Italian electrician), the consideration of which we will leave for a future lesson. It is owing to this pressure that a current of electricity flows around a conducting circuit. No current could possibly flow unless there was a difference of electrical pressure in the circuit, in the same way that no water would possibly flow through a water conductor unless there existed a difference of pressure. Instead of calling it the electrical pressure, we might call it the electricity-moving force, or the...
Сторінка 305 - I foot long and 1 mil in diameter is a mil-foot. Resistance and Conductivity. If we take a piece of wire whose resistance is 1 ohm, and apply an EMF to the ends of it, we find that it is able to conduct electricity. We might say that this piece of wire has unit conducting power, or unit conductivity, as well as unit resistance. If we take another piece of the same wire, but twice the length of the former piece, it will have twice the resistance, that is, it will conduct electricity only half as well...

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