Cover of booklet.





[previously] CONFIDENTIAL

Submarine Silhouette Book No. 1

March, 1917

[Office of Naval Intelligence]

[U.S. Navy Department Seal]

Washington
Government Printing Office
1917
























Image of U. 13-16 silhouette.
"U. 13-16."

Image of U. 17-20 silhouette.
"U. 17-20."
(A gun may now be mounted on fore side of conning tower.)

Image of U. 21-25 silhouette.
"U. 21-25."
(Gun may now have been moved to fore side of conning tower.)

Image of U. 26-32 silhouette.
"U. 26-32."
(Gun may now have been moved to fore side of conning tower.)

Image of U. 33-36 silhouette.
"U. 33-36."

Image of U. 37-44 silhouette.
"U. 37-44."

Image of U. 53 silhouette.
"U. 53."

Image of U.B. 18-29 silhouette.
"U.B. 18-29."

Image of U.C. 1-15 silhouette.
"U.C. 1-15."
"U.B. 1-17." (Very similar but 20 feet shorter.)

NOTE.


Masts, ventilators, and exhaust funnels are hinged or telescopic, and may be either up or down when the vessels are on the surface. One or both of the guns may be housed.
A German submarine has been seen underway, submerged to base of conning tower, with her masts up.
The block sketch of German submarines, class U. 26 to U. 32, may be accepted as perfectly reliable, being derived from a recent photograph, except that gun may now have been removed. The silhouette of U. 53 is reliable.
Alterations, particularly as regards periscopes and exhaust funnel, may have been made in some of the earlier classes since the outbreak of war.

Image of U 43-U50 silhouette.
U43-U50

Image of U 52-60 silhouette.
U52-U60

Image of UC 29-UC70 silhouette.
UC29-UC70

Image of U-B 18-48 silhouette.
U-B-18-48

Insert to face page 5
Confidential Submarine Silhouette
Book No. 1
Issued by Office of Naval Intelligence
March, 1917

Image of German Submarine U. 28. Length about 220 feet. Draught in surface trim about 13 1-2 feet.
German Submarine U. 28.
Length about 220 feet. Draught in surface trim about 13 1-2 feet.

Image of German submarine cruising on the surface.
German submarine cruising on the surface.

Image of German submarine painted with wave line.
German submarine painted with wave line.

Image of German submarine on the surface. Bow view.
German submarine on the surface.
Bow view.

Image of Submarine submerged. Only one periscope showing.
Submarine submerged.
Only one periscope showing.