HELICAL SPRINGS.
388
Compression Tests of Helical Springs for !-Inch Mortar
Carriages.
Counter-recoil springs.
No. of test, 10354.
No. of spring.	Weight.	Exterior diameter.	Diameter of wire.	Height unload- ed.	Dis- tance be- tween coils.	Height of spring when compressed at 1,000 pounds.	Closed Load.	down. Height.	Height of spring when returned to 1,000 pounds.	Remarks.
1	 2	 3		Lbs. ozs. 19 3* 18 13* 18 14*	Inches. 5.02 5.05 5.00	Inch. .68 .68 .68	Inches. 19.20 19.10 19.10	Inch. .80 .80 .80	Inches. 15.93 15.79 15.73 15.10 15.67	Pounds. 2,900 2,850 2,780 2,750 2,700	Inches. 9.56 9.35 9.45 9.46 9.44	Inches. 15.20 14.87 14.87 14.71 14.92	After being closed down 40* hours.
4		18 15	5.02	.68	19.12	.80					
Compression Test of Double Spring from Recoil Cylinder of 15-Pounder Gun for the Driggs-Seabury Gun and Ammunition Company, Derby, Conn.
No. 10281.
-H
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OUTSIDE SPRING.
Seventeen coils; diameter of wire, ".560. Free height, 18".41.
2,53
inside spring.
Twenty-three coils; diameter of wire, ".377. Free height, 17". 33.
SPRINGS TESTED TOGETHER.
Load.			Height when closed.	Free heights.	Set of outside spring.	Set of inside spring.
Height 15 inches.	Height 10 inches.	Closed down.				
Pounds. 1,290	Pounds.	Pounds. 33,000	Inches. 10.02	Inches.	Inch.	Inch.
						
AFTER COMPRESSING THE SPRINGS FROM 15" TO 10" ONE HUNDREI						TIMES. .38
1,190	33,000	33,000	10.00	f 18.24 \ 16.95	}