Electricians' Operating and Testing Manual; A Hand Book for Men in Charge of Electrical Apparatus, Repair Men, Trouble Men, Lamp Trimmers, and Electricians Generally

Electricians' Operating and Testing Manual; A Hand Book for Men in Charge of Electrical Apparatus, Repair Men, Trouble Men, Lamp Trimmers, and Electricians Generally

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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. 1916 edition. Excerpt: ...their E.M.F. added to that of the battery Figure 124 A method of arranging a storage battery so that it can be charged without the use of a booster is shown in Figure 124. This battery is arranged so it can be charged in parallel, and for this purpose is divided into two parts. When arranged for charge the two switches in the upper center are thrown downward and all of the end cells are cut into the circuit so they will be included in the charge. Current now passes from the positive pole of the circuit through all of the resistance R, and the switch S to the two halves of the battery. As the counter E.M.F. of the battery develops resistance is cut out of the circuit by closing the switches connected to the resistance, beginning at the right, one at a time and as fast as it appears necessary. Closing the last of these switches at the left cuts out all resistance. Two ammeters are provided so the current in both sides can be watched. Ordinarily this battery "floats" in the system and when arranged for work upper switch S is opened and lower switch S is closed. With this connection the battery will feed into the line whenever the pressure of the line falls below the normal and take current from the line when the pressure is normal or above. Double scale ammeters should be used. They will show whether the battery is receiving or sending current. When storage batteries are to be charged from alternating current lines, the Cooper-Hewitt Mercury Rectifier may be used. This mercury alternating current rectifier consists of a glass bulb fitted with four electrodes. Two of these are of graphite and two of mercury. The mercury electrode will not allow a negative current to pass through into the vapor in the bulb, but does not resist the...show more

Product details

  • Paperback | 68 pages
  • 189 x 246 x 4mm | 141g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236887115
  • 9781236887115