YOUNG, J. ELTON. Electrical Testing for Telegraph Engineers. Illus- 

 trated. 8vo., cloth, 264 pp Net, $4 .00 



ZEIDLER, J., and LUSTGARTEN, J. Electric Arc Lamps: Their Princi- 

 ples, Construction and Working. 160 Illustrations. 8vo., cloth, 

 188 pp Net, $2.00 



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