REPORT OF NATIONAL MUSEUM, 1921. 133 
F-5-L, and an aeromarine 39-B seaplane. The first of these is sec- 
tionalized to show the process of manufacture and forms one of the 
most interesting objects in the entire war collection. Planes of this 
type were used for patrol and convoy duty in the war zone during 
the great conflict. Their wing spread is 103 feet 10 inches, length 
over all 49 feet 4 inches, gasoline capacity 495 gallons, speed 100 
miles an hour, horsepower 800, and weight with field load 13,000 
pounds. They are equipped with radio, four 230-pound bombs, 10 
Lewis guns, and 1 Davis nonrecoil gun. They carry a crew of five 
including two pilots, a radio operator, a bomber, and a mechanician. 
Power is derived from two Liberty motors and the possible cruising 
‘radius is about eight hours. This splendid plane with its hugh bulk 
and massive wings suggesting a fabled marine bird of prehistoric 
times, its powerful motive engine, its gasoline tanks, its delicate and 
complicated apparatus for purposes of navigation and communica- 
tion, and, finally, its bombs for offensive, and its guns for defensive 
purposes may well be taken as a suitable illustration of the wonder- 
ful use by the Navy Department of this latest and most efiective 
enemy of the submarine and protector of friendly shipping. This 
exhibit is made even more graphic and effective by the installation 
of four model figures representing as many members of the crew at 
their respective stations with flying suits and equipment as actually 
used in time of war. The second plane deposited by the Navy De- 
partment is a much smaller scout plane, known as an aeromarine 
39-B, ‘This plane is equipped with a Curtiss 100-horsepower engine 
capable of making 1,400 revolutions a minute with a speed of 68 
miles an hour. The upper wing of this plane is 47 feet in width, the 
lower 36 feet, the length over all 30 feet, and the height 13 feet. 
In the rotunda of the Natural History Building are a number of 
very interesting models showing the types of vessels used by the 
Navy in the war zone, including the torpedo-boat destroyer Manley, 
which did patrol duty and chased enemy submarines from December 
26, 1917, to November 11, 1918; a submarine chaser, 441 of which 
were built during the war and 121 performed efficient service on the 
coast of France and in the Mediterranean; an Eagle boat designed 
especially to chase enemy submarines, but none of which were fin- 
ished in time to take part in the war; a submarine of late model; the 
converted yacht Corsair representing a type of converted yacht used 
as an auxiliary very successfully during the war; and a mine sweeper 
designed especially to remove loaded mines from the paths of other 
ships. Thirty-six of the latter were sent to Europe after the armis- 
tice was signed for duty in connection with the removal of the 
North Sea barrage. 
Of great interest in connection with these models are a number of 
marine instruments of the most recent type used on naval vessels for 
