Ubåde

Photo No. 25. Photo No. 25. General View of one Section of the Works, showing two of the Diving Bells. Each Bell measures 17 ft. by 10 ft. by 6 ft. 6 in. high and weighs about 35 tons

Photo No. 26. Another view showing a 45-ton concrete block being lowered into position. After the Sea bed has been levelled and prepared by Diving Bell men, the concrete blocks are set in place by Helmet divers. One of the Helmet divers’ boats can be seen in the foreground.

Photo No. 29; Photo No. 30

Photo No. 33 BRITISH SUBMARINE "A3."

Fig. No. 37. LONGITUDINAL SECTION; Fig. No. 38. TRANSVERSE SECTION

Fig. No. 39. LONGITUDINAL SECTION; Fig. No. 40. TRANSVERSE SECTION

Copyright. Photo No. 42. Practising getting into and out of Air-lock; Copyright Photo No. 43. Man in Air-Lock being lowered to bottom of tank

Fig. No. 45. BOAT HOLED AT THE TOP; Fig. No. 46. BOAT HOLED LOW DOWN

Method of training men in the use of the Patent Submarine Life-saving apparatus at H.M. Dockyard, Portsmouth.

Photo No. 49. A SUBMARINE ROCK BLAST

Methods of Connecting Electric Detonator Fuses in Series and in Parallel, For Submarine Blasting of Wrecks, Rock, &c

Photo No. 50. BLOWING UP THE S.S. “EGRET” BY THE TRINITY CORPORATION. {“TONITE” USED.)

Photo O; Photo P; Photo Q; Photo R; Photo S

Photo T; Photo U

Fig. 94

Bushnell's "Turtle." 1776

By courtesy Lake Torpedo Boat Co. Lake's First Submarine. Argonaut Jr; By courtesy Lake Torpedo Boat Co. Simon Lake's Argonaut First

Forward deck of Submarine G-4. Driving into a swell at full speed

British Submarine H-20 Built by the Fore River Ship Building Co., and similar to the U.S. Navy II class. Note circular hull

Experimental Submarine with Propellers Forward

U-boote