D. VAN NO STRAND. 21 



Sabine's History of the Telegraph. 



12mo. Cloth. $1.25. 



HISTOEY AND PROGRESS OF THE ELECTEIO TELE- 

 GRAPH, with Descriptions of some of the Apparatus. By 

 ROBERT SABI^E, C. E. Second edition, with additions. 



CONTENTS. I. Early Observations of Electrical Phenomena. II. Tele- 

 graphs by Frictional Electricity. III. Telegraphs by Voltaic Electricity. 

 IV. Telegraphs by Electro-Magnetism and Magneto-Electricity. V. Tele- 

 graphs now in use. VI. Overhead Lines. VII. Submarine Telegraph Lines. 

 VIII. Underground Telegraphs. IX. Atmospheric Electricity. 



Haskins' Galvanometer. 



Pocket form. Illustrated. Morocco tucks. $2.00. 



THE GALVANOMETER, AND ITS USES; a Manual for 

 Electricians and Students. By C. H. HASKINS. 



" We hope this excellent little work will meet with the sale its merits 

 entitle it to. To every telegrapher who owns, or uses a Galvanometer, or 

 ever expects to, it will be quite indispensable." The Telegrapher. 



Culley's Hand-Book of Telegraphy. 



8vo. Cloth. $6.00. 



A HAND-BOOK .OF PRACTICAL TELEGRAPHY. By 

 R. S. CTLLEY, Engineer to the Electric and International 

 Telegraph Company. Fifth edition, revised and enlarged. 



Foster's Submarine Blasting. 



4to. Cloth. $3.50. 



SUBMARINE BLASTING in Boston Harbor, Massachusetts- 

 Removal of Tower and Corwin Rocks. By JOHN G. FOSTER, 

 Lieutenant-Colonel of Engineers, and Brevet Major- General, U. 

 S. Army. Illustrated with seven plates. 



LIST OF PLATES. 1. Sketch of the Narrows, Boston Harbor. 2. 

 Townsend's Submarine Drilling Machine, and Working Vessel attending. 

 8. Submarine Drilling Machine employed. 4. Details of Drilling Machine 

 employed. 5. Cartridges and Tamping used. 6. Fuses and Insulated Wires 

 used. 7. Portable Friction Battery used. 



