FREE TEST OF PISTON EOD FOR 15-POUNDER GUN.
206
No. 10285.
Free Test of Piston Rod for 15-Pounder Gun, for the Driggs-Seabury Gun and Ammunition Company, Derby, Conn.
Measurements taken by means of a caliper over ends of rod.
Loads of tension applied to the rod between the head and spherical seated nut. Washers with spherical seats used to secure axial direction of line of pull.
Remarks.
Initial load.
Applied loads.	Gauge readings.	
	Direct movement.	Set.
Pounds.	Inch.	Inch.
1,000	0.	0.
5,000	.0014	
10,000	. 0035	
20,000	. 0075	
30,000	.0117	
40,000	.0159	
50,000	.0198	
60,000	.0238	—. 0002
70,000	.0283	
80,000	.0324	
90,000	.0366	
100,000	.0410	—. 0002
110,000	.0451	
120,000	.0497	
131,966	.0549	—. 0002
Test discontinued.
The apparent minus set of " 0002 was attributed to a change in the temperature of the caliper arm employed during the progress of the test.