MALCOLM, W. H. Theory of the Submarine Telegraph Cable.

In Press

Second Edition. Illustrated. 16mo M cloth, 155 pp. (No. 64 Van Nostrand's Science Series.) 50 cents

MASSIE, W. W., and UNDERBILL, C. R. Wireless Telegraphy and Telephony Popularly Explained.

With a chapter by Nikola Tesla. Illustrated. 12mo., cloth, 82 pp Net, $1.00

Illustrated. 8vo., cloth. 167 pp Net, 3.50

MIESSNER, B. F. Radiodynamics.

The wireless control of torpedoes and other mechanisms. 112 illustrations, 5 1/2 x 8 1/4, cloth, 211 pp. Net, $2.00