90 



Dr. ScoRESBY replied that the experiments were, within 

 certain limits, irrespective of bulk. He had compared steel 

 of very different lengths, and had obtained (after application 

 of an ascertained correction) very analogous results. But to 

 save calculation, and to make the results more satisfactory, it 

 was better that they should be similar. 



The Rev. W. Turner inquired whether they could depend 

 on the test-bar — would it have the same degree of magnetism 

 after a succession of tests, as at the commencement ? 



Dr. ScoRESBY said, in order to determine that, he had 

 ascertained the power of the test-bar before experimenting, 

 and then after he again examined it, and if it had lost any- 

 thing the experiment was not a good one. The test-bars he 

 used were made on the principle of having them as hard as 

 possible — and with the bar exhibited to them, great numbers 

 of plates might he tested without any effect on the test-bar. 



Alfred Harris, Esq. moved the thanks of the meeting 

 to the Rev. Chairman for his lucid explanation of the subject. 



William Rand, Esq. seconded the resolution, which was 

 carried unanimously. 



Mr. Clay introduced to the notice of the company a 

 beautiful geological model of the Forest of Dean, made by 

 Mr. Sop with, of Newcastle, for Professor Sedgwick, of 

 Cambridge, and at the request of Mr. Clay, Mr. Morton 

 briefly explained it. 



The Rev. Chairman, in introducing the second paper, 

 said, that it was with reference to the manufacture of iron 

 by the hot or cold blast methods. The communication had 

 reference to the hot blast side of the question. It would be 

 read then, and the discussion upon it would take place in the 

 evening. This appeared to be a matter of much controversy 

 among practical men at present. 



