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RECOIL MECHANISM----15-POUNHER GUN NO. 12.
4i״ x 1" fitted across the cheeks of the
steel oscillating slide at the rear end, in order to restrict the outward movement of the slide at this place.
Measurements on gauged length N.
Applied loads.	Gauge readings.		
	Direct movement.	Set.	Remarks.
Pounds. 1,000 10,000	Inch. 0. -.0017	Inch. 0.	Initial load. Movement inward toward the gun.
20,000	-.0041		
30,000	-.0094		
40,000	-.0118		
50,000	-.0139		
60,000	-.0159		
50,000	-.0167		
40,000	-.0158		
30,000	-.0135		
20,000	-.0110		
10,000	-.0076		
1,000		-.0015	
			
Measurements on gauged length M.
1,000	0.	0.	Initial load.
10,000	.0030		
20,000	.0038		
30,000	.0053		
40, 000	.0070		
50,000	.0089		
60,000	.0109		
50,000	. 0092		
40,000	.0066		
30,000	.0020		
20,000	.0002		
10,000	-. 0005		
1,000		-.0002	
. Gauged length L inaccessible on account of the presence of the iron dog.
Gun rotated 180° and brought bottom side up. Iron doo■ still in place.	®
Measurements on gauged length B, over ends of piston rod.
1,000	0.	0.	
10,000	.0031		
20,000	.0066		
30,000	.0099		
40,000	.0130		
50,000	.0163		
60,000	.0192		
50,000	.0192		
40,000	.0189		
30,000	.0163		
20,000	.0106		
10,000	.0051		
1,000		.0003	
H. Doc. 508-----14