The Electrical Engineer's Handbook; A Convenient Reference Book for All Persons Interested in Electricity and Magnetism, Dynamos and Motors, Electric

by International Schools

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. 1908 ... of the electrolyte is in direct proportion to the ampere-hours taken out, and is, therefore, a reliable guide as to the amount of discharge. MISCELLANEOUS POINTS Restoring Weakened Cells.--There are several methods of restoring cells that have become (1) Overcharge the whole battery until the low cells are brought up to the proper point, being careful not to damage other cells in the battery. (2) Cut the low cells out of circuit during one or two discharges and in again during charge. (3) Give the defective cells an individual charge. Before putting a cell that has been defective into service again, care should be taken to see that all the signs of a full charge are present. Sediment in Cells.--During service, small particles drop from the plates and accumulate on the bottom of the cells. This sediment should be carefully watched, especially under the middle plates where it accumulates most rapidly, and should never be allowed to touch the bottom of the plates and thus short-circuit them. If there is any free space at the end of the cells, the sediment can be raked from under the plates and then scooped up with a wooden ladle or other non-metallic device. If this method is impracticable, the electrolyte, after the battery has been fully charged, should be drawn off into clean containing vessels; the cells should then be thoroughly washed with water until all the sediment is removed, and the electrolyte should be replaced at once before the plates have had a chance to become dry. In addition to the electrolyte withdrawn, new electrolyte must be added to fill the space left by the removal of the sediment; the new electrolyte should be of 1.3 or 1.4 sp. gr. in order to counteract the effect of the water absorbed by the plates while being washed. If at an...

80 pages, Paperback

Published May 21, 2012