207
RECOIL MECHANISM 15-ROUNDER GUN NO. 12.
No. 10286.
Driggs-Seabury 15-Pounder Gun No. 12, with Steel Oscillating Slide in Lieu of the Bronze Slide.
Gun in firing position, bottom side up.
Measurements on gauged length A, bottom of sleeve, rear end of lug to fixed block on gun.
Initial load.
Applied loads.	Gauge readings.	
	Direct movement.	Set.
Pounds.	Inch.	Inch.
1,000	0.	0.
10,000	.0040	
20,000	.0104	
80,000	.0164	
40,000	.0227	
50,000	.0282	
60,000	. 0340	
50,000	.0340	
40,000	.0340	
30,000	.0337	
20,000	.0261	
10,000	.0133	
1,000		0.
Measurements on gauged length C, from bottom of oscillating slide, front end of lug to fixed block on gun.
1,000	0.	0.	Initial load.
10,000	.0030		
20,000	.0098		
30,000	. 0165		
, 40,000	. 0225		
50,000	.0282		
60,000	.0342		
50,000	.0342		
40,000	.0342		
30,000	. 0342		
20,000	.0265		
10,000	.0141		
1,000		. 0017	
60,000	.0356		
1,000		.0017	
On gauged length B, over end of piston rod.
1,000	0.	0.	Initial load.
10,000	.0031		
20,000	.0061		
30,000	.0092		
40,000	.0124		
50,000	.0155		
60,000	.0185		
50,000	.0185		
40,000	.0183		
30,000	.0177		
20,000	.0116		
10,000	.0059		
1,000		.0006