IIOSKIAER. A Guide for the ElectricTesting of Telegraph Cables. 

 Second edition. 12rno, cloth. 10 plates. . . $1.50. 



LOCKWOOD. Electricity, Magnetism, and Electric Telegraphy. 

 A Practical Guide and Hand-Book of General Information for 

 Electrical Students, Operators, and Inspectors. 8vo, cloth, 376 

 pages, 152 illustrations ....... $2.50. 



LORING. A Hand -Book of the Electro -Magnetic Telegraph. 

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MAVER AND DAVIS. The Quadruplex. With Chapters on the 

 Dynamo-Electric Machine in Relation to the Quadruplex, The 

 Practical Working of the Quadruplex, Telegraph Repeaters and 

 the Wheatstone Automatic Telegraph. By Win. Maver, Jr. 

 8vo, cloth, 126 pages, 63 illustrations. . . . $1.50. 



PLUM. The Military Telegraph During our Civil War. Two 

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POPE. The Modern Practice of the Electric Telegraph. Ninth 

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PRESCOTT. Electricity and the Electric Telegraph. 8vo, cloth, 



670 illustrations. 2 vols ....... $5.00. 



SABINE. History and Progress of the Electric Telegraph. 12mo, 



cloth, 134 illustrations ....... $1.25. 



SMITH. Manual of Telegraphy. Designed for beginners. 8vo, 



31 illustrations ........ $0.30. 



TERRY AND FINN. Illustrations and Descriptions of Tele- 



graphic Apparatus. Oblong 8vo, cloth, 92pp., 30 plates. $1.50. 



WILLIAMS. Manual of Telegraphy. Cloth, 327 pages, 90 illus- 

 trations .......... $4.20. 



TELEPHONY. 



DOLBEAR. The Telephone. An account of the Phenomena 

 of Electricity, Magnetism and Sound, as Involved in its Action, 

 with Directions for Making a Speaking Telephone. 18mo, cloth. 

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DU MONCEL. The Telephone, the Microphone, and the Phono- 

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LOCKWOOD. Practical Information for Telephonists. New 

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PRESCOTT. Bell's Electric Speaking Telephone. Its Invention, 

 Construction, Application, Modification, and History. 8vo, 

 526 pages, 330 illustrations ...... "$4.00. 



THOMPSON. Philip Reis, Inventor of the Telephone ; a Bio- 

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 of the Original Papers of the Inventor and Contemporary Publi- 

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