Deviation of the Compass in Iron Ships

1866 Scientific American  
The Anglo·American Telegraph Company has been established for the purpose of executing, in the course of the prpsent year, the enterprise ot Ie ying a submarine cable bet ween Ireland and Newfoundland, so as to connect telegraphically the Old World :lnd the New, and to raise the callie partially laid last year in order to complete a second line to America. An important meetirg was I:telu on the 14th of Marcb, in the Common Hail, Hackin's hey, Liverpool, for the purpose 01 having the prospects
more » ... ing the prospects of the undertak· ing fully explained. It wa� ycry numerously attended by some of the leading ship owners and merchants of the town, and by the representati ves 01 the various telegraph companies. STATEMENT OF THE ELECTRICIAN. Mr. Varley, electrician to the company, made a long statement, from wbich we extract the most in. teresting portions. He said that Prof. Wm. Thom· son, professor of natural philosophy at the Universi ty of Glasgow, who was second to none in mathe· matical engineering, had gone very carefully into the question relating to the effect of the water upon the operation of laring and recovering caLles. And from the fact that the strain on the cable was only fourteen hundred weight during the operation of paying out, he was enabled to calculate precisely what was the action of the waler during the operatiJn ot sub mersion; and he had found that the cable from the ship, owing to its light specific gravity, llnd the re sistance which it experienced in pa:osing through thQ water, sank so slowly that the cable from lhe stern of the vessel to where it touched the ground followed an incline extending over a distance of no less than seventeen miles from the stern of the vessel; in other
doi:10.1038/scientificamerican04141866-239a fatcat:k2xavq5klrhgzjcwuf6ce2ee7m