Bell Telephone Laboratories School for War Training, ca. 1944. Fourth Edition. 4to. 194,  pp. Illustrations. This is Copy No. D 190. The first page in the book indicates the work as Restricted and provides the name to whom the copy was charged. Printed staplebound wrappers in very good condition. Item #20056
Much of the material in the early chapters has been taken by permission from the book "Principles of Electricity Applied to Telephone and Telegraph Work", copyrighted 1939 by American Telephone and Telegraph Company. Chapters include Electric Shock Hazard; Connecting and Soldering; mathematical Priniples; Elementary Definitions and Ohm's Law; The Solution of D-C Networks; Magnetism; Electrical Measuring Instruments; The D-C Dynamo-electric Machine; Inductance and Capacitance and much more.