Electrical Railroading

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F. J. Drake & Company, 1908 - 918 стор.

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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 earth's surface, the attraction for a mass of matter will diminish, or...
Сторінка 141 - Ground wires for lightning arresters should 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 from a lightning arrester be put into iron pipes, as these would tend to impede the discharge.
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 218 - BTU is an abbreviation for a British Thermal Unit, being the amount of heat required to raise one pound of water from 39 to 40 degrees Fahrenheit (ordinary thermometer).
Сторінка 82 - The area of the surface of a sphere is equal to the product of the diameter by the circumference of a great circle. Let...
Сторінка 140 - 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.
Сторінка 72 - ... 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 inverse set of operations will be taking place. For when...
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 380 - Heat in Watts is equal to the Square of the current multiplied by the resistance of the generator.
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...

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