This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1891 Excerpt: ...degree, the action of the other machine would be, not to pull it back into phase, but to throw it further and further out of phase, because more work would be required of the slow machine, which would tend to still further slow it. This is very clearly shown by Dr. Hopkinson, by graphic and other proofs. On the other ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1891 Excerpt: ...degree, the action of the other machine would be, not to pull it back into phase, but to throw it further and further out of phase, because more work would be required of the slow machine, which would tend to still further slow it. This is very clearly shown by Dr. Hopkinson, by graphic and other proofs. On the other hand, parallel working shows a state of things exactly the reverse of this. Alternating dynamos, in fact, tend to pull one another into phase or agreement. Switching in Parallel.--The conditions under which alternators are used, are generally as follow: For feeding a system of incandescent lamps, the mains may have a capacity for the output of several dynamos. During the early hours of the evening only a small proportion of the lamps upon the mains may be alight. As darkness sets in, lamps are turned on and the output of, say, the single alternator, may have to be increased from time to time (either automatically or by hand government), until its load is as great as the dynamo is known to be capable of maintaining without overheating. It now becomes necessary to switch on another alternator. This obviously would not be done until the speed of the fresh machine had attained a maximum. But if the fresh alternator happened to be at exactly the same phase, and by a rare chance the same period of phase as the SYNCHRONISING OF TWO ALTERNATORS. 239 first machine, it would take half the load without in the least disturbing the brightness of the lamps, and once yoked together the two would work in perfect unison. Only, however, by chance would the fresh machine arrive at this exact condition or fall into step, and such a rare contingency is never relied upon. If switched in when not " in phase," the fresh machine would, it is true, be quickly ...
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Seller's Description:
Very Good. No Jacket. Cloth. No Jacket. 12mo-over 6¾"-7¾" tall. Subtitled: For the Use of Engineer-Constuctors and Electricians-In-Charge, Embracing Framework Building, Field Magnet and Armature Winding and Grouping, C ompounding, & c.; With Examples of Leading English, American, and Continental Dynamos and Motors. The author also wrote "Electric Light" and "Electric Light Fitting". Boards are hunter and have pebble d texture. Some rubbing and minor bending on spine edges, but o/w in good condition. Chocolate eps. Owner's name on flyleaf. Pages xiv to 18 are stained, four pages have equations written in ink, hing e is cracked on page 81, bottom-edge and fore-edge of pages are water-stained, however the book is strong and solid. Professional book dealer since 1975. All orders are processed promptly and packaged with the utmost care. Satisfaction guaranteed.
