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METALLURGY   OF   CAST-IRON.
tests, but only give results of eight of them here, for the reason that in the case of the others I desire to make experiments that will require much time, and that should be compiled with the second series to give complete results in that line of inquiry. As the first series of tests is distinct, in showing what effect low silicon and high sulphur have upon the fusibility of iron, as compared with high silicon and low sulphur with the total carbon and the " iron " closely constant, I permitted the appearance of this paper at the request of the secretary. The second series of tests is given in pages 332 to 344.
TABLE NO.  70 — COMPARATIVE FUSING TESTS   OF HIGH AND LOW SILICON AND LOW SULPHUR IRONS.
"Heat" Nos.	i	2	3	4	5	6	7	8
Form of iron charged	Pig.	Block.	Pig.	Block	Pig.	Block.	Piff.	Block.
Weight   of   iron charged each side..	150	65	100	54	40	35	64	50
Blast turned on ........	i.'55	-i-35	2:13	2:o8j4	4:21	1:56	1:44	2:26
Harder iron running	i:57	1:39	2:21	2:12%	4:27	2:02^	1:50	2:32%
Softer iron running..	i:57%	1:40	2:21^	2:i3K	4:28	2:02	i :5oJ.-£	2:34$*
First mold of harder iron filled ...........	i:59	1:42	2:24	2:16	4:3r-X	2:06*4	2 :55	2:37-H
First mold of softer iron filled ........	2:01	1:43	2:24	2  r5 1/,	4:32%	2:07	2:55^	2:38^
Second   mo-Id  of harder iron filled...		i:43	2:26	2  iy	4:36		2:57	2:40
Second mold of softer iron filled .............		1:44	2:26	2 16%	4=38%		2:58	2:41
Third    mold    of harder iron filled...		1:44	2:27.^	2  I7H				
Third mold of softer iron filled ......		i:45	2:28	2  17%				
Harder iron all down	2:1914	1:49	2:37^2	2  18	4o7	2:oi)J/2	2:02-%	2:47^
Softer iron all down.	2:22	1:50	2:39	2:iSJ4	4:40	2:11	2:05	2:4*%
Time of melting ......	25111.	inn.	i6^m.	6m.	13111.	lom.	.15111.	I5-K in-
First iron to melt .....	Hard.	Hard.	Hard.	Hard.	Hard.	Hard.	Hard.	Hard.
Time   exceeding its mate ............. ....... r	45 s.	i m.	10 s.	45 s.	i m.	15 s.	nil 3os	nn 458
First iron all down...	Hard.	Hard.	Hard.	Hard.	Hard.	Hard.	Hard.	Hard.
Time exceeding   its mate..	2111 3Os	i m.	mi 3os	3OS.	3111.	im ^os	Jill   l^S	i in.