REPORT OF NATIONAL MUSEUM, 1931. 133 



F-6-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 

 j^urposes may well be taken as a suitable illustration of the wonder- 

 ful use by the Navy Department of this latest and most effective 

 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 t^^pes 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 A^ery 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 



