Cyclopedia of engineering: a general reference work on steam boilers and pumps, steam, stationary, locomotive, and marine engines, steam turbines, gas and oil engines, producers, elevators, heating and ventilation, compressed air, refrigeration, types and management of dynamo-electric machinery, power stations, etc, Volume 1

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Page 469 - LIBRARY GRADUATE SCHOOL OF ENGINEERING HARVARD UNIVERSITY Please sign your name and address on this card, and deposit in box provided. This book may be kept...
Page 1 - SELECTION OF A MACHINE. The voltage, capacity, and type of machine are dependent upon the system to which it is to be connected, and the purpose for which it is to be utilized, but there are certain general features which should be considered in every case. Construction. This should be of the most solid character and guaranteed first-class in every respect, including materials and workmanship. Finish. A good finish is desirable, since it is likely to cause the attendant to take greater care of the...
Page 85 - They should be stamped with about 80 per cent. of the maximum current which they can carry indefinitely, thus allowing about 25 per cent. overload before the fuse melts. With naked open fuses, of ordinary shapes and with not over 500 amperes...
Page 11 - It has been found that the best results are obtained when the tension in the driving side of the rope is only 3 to 4 per cent of the breaking strength.
Page 247 - A converter is a machine employing mechanical rotation in changing electrical energy from one form into another. A converter may belong to either of several types, as follows : A direct-current converter converts from a direct current to a direct current, usually with a change of voltage.
Page 71 - This is accomplished by following substantially the same directions as for starting them, but in the reverse order. A generator operating alone on a circuit can be slowed down and stopped without touching the switches, brushes, etc., in which case the current gradually decreases to zero; and then the connections can be opened without sparking or any other difficulty. However, when a generator is operating in parallel with others, or with a storage battery, it must not be stopped or reduced in speed,...
Page 126 - An iron screw-driver or other tool held between the field magnets near the revolving armature, vibrates very perceptibly as the short-circuited coil passes. Almost any armature, particularly one with teeth, will cause a slight but rapid vibration of a piece of iron held near it; but a short circuit produces a much stronger effect only once per revolution. Care should be taken not to let the piece of iron be drawn in and jam the armature. The current pulsates and torque is unequal at different parts...
Page 11 - Belting. There are two methods of arranging rope transmission: one consists in using several separate belts; and the other employs a single endless rope which passes spirally around the pulley several times and is brought back to the first groove by a slanting idle pulley, and therefore is called the "wound
Page 37 - The fields of series motors are sometimes "overwound," that is, so wound that they will have their full strength with even one-half or one-third of the normal current. The objects are to secure a nearly constant speed with varying loads, to enable the motor to run at high efficiency when drawing small currents, and to prevent sparking at heavy loads. In multipolar motors having more than two field-coils, the coils are all connected together, and are equivalent to the single pairs of coils shown in...

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