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THE SCIENTIFIC PAPERS OF 



that there was almost no limit to the hydraulic pressure that could 

 be called into requisition. The special object he had in view was 

 to place telegraph cables under the equivalent of Atlantic pressure. 

 Into the plungers cores of insulated wire were placed, and a 

 pressure equal to the deep-sea Atlantic pressure was applied. It 

 was of great value for such a purpose, inasmuch as it ensured the 

 soundness of the insulating covering when it came to be subjected 

 to the enormous pressure which it had afterwards to bear. But 

 he thought that hydraulic arrangements of equal force would be 

 applicable with great advantage for metallurgical purposes in 

 pressing rather than beating steel into its definite form. 



In the discussion of the Paper 



" ON THE COMPAEATIVE ENDURANCE OF IRON AND 

 MILD STEEL WHEN EXPOSED TO CORROSIVE 

 INFLUENCES," by DAVID PHILLIPS, M. Inst. C.E., 



DR. C. W. SIEMENS * said, it perhaps would have been better 

 if the discussion had been commenced by persons more interested 

 in the use of iron and steel, than by those who, like himself, were 

 intimately connected with their production ; but in another respect 

 it might possibly save the time of the Institution, if he took that 

 early opportunity of referring to some conclusions in the paper 

 with which he could not agree. The author had given the results 

 of elaborate experiments on a subject which was of the utmost 

 importance to engineers ; and if his conclusions were to be relied 

 upon, engineers were daily committing a grave error in using a 

 material which gave so slight a guarantee of endurance. But 

 while he accepted every one of the experimental facts adduced 

 by the author, he thought he was in a position to prove, from 

 the author's figures alone, that his conclusions were entirely 

 erroneous. He had referred, in the first place, to a long series 



* Excerpt Minutes of Proceedings of the Institution of Civil Engineers, Vol 

 LXV. Session 1880-1881, pp. 98-101. 



