Electric switch and controlling gear. A handbook on the design, manufacture and use of switchgear and switchboards in central stations, factories and mines: By Charles C. Garrard, Ph.D., M.I.E.E., A.Am.I.E.E. Third edition, revised and enlarged. xiv-783 pages, 23 × 15 cm., cloth. New York, D. Van Nostrand Company, Inc., 1927. Price, $18