The Bessemer Monthly Volume 169-192

The Bessemer Monthly Volume 169-192

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 edition. Excerpt: ...The word, however, seems rather too aptly and humorously to describe the very uncertainty that we have sought to avoid. Theoretically, there seems to be no reason why the plug should not endure infinitely but its construction involves many processes and its use in strange hands many uncertainties. It seems wise therefore, to limit ourselves to the terms of our usual contract calling for replacement of defective workmanship or material within one year after shipment. Price and advantages considered, a year of service makes the plug a really commercial article and there is every reason to expect a far greater life. Figure 1 shows a section of the starting plug applied to a Type IV engine. The resistor is a steel sheathed insulated nichrome conductor. At the lower end the conductor is brought thru the insulation and welded engines. We have made tests of Westinghouse transformer No. 122330 and have found it satisfactory. if no current is available at starting time we use storage cells. In order to keep the battery cost within limits, we work at a very high rate of discharge. The Edison battery gives satisfactory service under these conditions, twelve cells type B 4 serving a single plug, twelve cells type A 4 for a twin installation. The low voltage plug has specific advantages for use with a storage battery installation, high voltage requiring such a number of cells as to be prohibitive in cost. For charging various means are available. An exciter may be made to charge thru a proper grid or bank of lamps while the plant is lightly loaded. Most small lighting plants have a charging set for custom work. Its service would be required about fifteen minntes per day or with care in the use of current, a somewhat longer interval--every three, four...show more

Product details

  • Paperback | 76 pages
  • 189 x 246 x 4mm | 154g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236839188
  • 9781236839183