374	CAST IBON AND PIG IRONS
Cast Ikon from Watertown Arsenal Foundry—Continued.
No. of test.	Mark.	Description.	Chemical composition.								Diam- eter.	Tensile strength per square inch.	Fracture.	Specific ־ gravity.
			Carbon.			Man- ga- nese.	Sili- con.	Sul- phur.	Phos- phorus.	Cop- per.				
			Total.	Graph- itic.	Com- bined.									
											Inches.	Pounds.		
6595	247										1.129	26,310		7.194
6598	248		do										1.129	23', 000		7.118
6599	249										1.129	24,400		7.118
6600	250										1.129	26', 300		7.130
6601	251										1.129	27,290		7.282
6605	254										1.129	36'510		7.209
6612	260										.564	30' 960		7.132
6616	263										1.129	32'000		7.143
6663	306										1.129	28'230		7.128
6566	222										1.129	26,300		7.117
6605	254										1.129	36,510		7.209
6561	218										1.129	27,900		7.208
6480	182										1.129	29', 400		7.194
		ring.												
6612	260										.564	30,960		7.132
6616	263										1.129	32'000		7.143
6621	268										1.129	28,100		7.229
6428	158										1.129	33,520		
6450	171										1.129	31,900		
6455	172										1.129	30,500		7.125
6493	188	path.									1.129	29,480		7.214
6437	164										1.129	33,980		7.219
6574	230										1.129	29,700		7.184
6587	240										1.129	29,800		7.186
6596	240										1.129	28,550		7.124
6597	240						1				1.129	29,500		7.150
6612	260										.564	30,960		7.132
6616	263										1.129	32,000		7.143
6621	268										1.129	28,100		7.229
6654	300										1.129	30'l00		7.193
6558	216										.564	25' 400		7.211
6577	232										.505	19;800		6.813
													with blowholes.	
6424	155										1.129	31,020		7.252
							i			״			tied."