Edinburgh New Philosophical Journal (1863) Edinburgh New Philosophical Journal . edinburghnewphil181863 Year: 1863 Royal Society of Edinburgh. 153 tion on the days following the 4th of February, when engaged in re- pairing some damage which had then occurred to the electric wires connecting the Nelson Monument and the Observatory; and finding that plumbers (employed by the Town-Council) were removing the old lead and substituting new in its place, and being also encouraged by Professor P. Gr. Tait, who with me visited the spot, to believe that the markings which had been discovered were elect
Edinburgh New Philosophical Journal (1863) Edinburgh New Philosophical Journal . edinburghnewphil181863 Year: 1863 Royal Society of Edinburgh. 153 tion on the days following the 4th of February, when engaged in re- pairing some damage which had then occurred to the electric wires connecting the Nelson Monument and the Observatory; and finding that plumbers (employed by the Town-Council) were removing the old lead and substituting new in its place, and being also encouraged by Professor P. Gr. Tait, who with me visited the spot, to believe that the markings which had been discovered were electrically of unusual interest, I lost no time in applying to Mr J. D. Marwick, town-clerk, for those portions of the leaden covering which con- tained the marks in question, with the view of presenting them to the Eoyal Society. Mr Marwick was as obliging as prompt in responding to such a request, and sent me the required specimens next day, accompanied by the enclosed memorandum written by Mr H., assistant to Mr Cousin, city-architect, 10th February 1863. ' The accompanying pieces of lead were taken from the north- west side of the lead platform on the roof of the lower part of Nelson's Monument. ' The distance between the holes was about nine feet six inches. ' Both holes were immediately over a block-tin gas-pipe, which is here carried under the lead and boarding of the platform, and which was found melted the whole length between the two holes, and a foot beyond the north-east hole. ' These holes in the lead were evidently directly caused by the burning gas from the pipes underneath. Fig. 1. B : BOARDING tl The sketch shows section through the platform between the two holes A and B. CD shows the gas-pipe under and between them. ' From this sketch we might naturally expect a hole melted in the lead at A, the pipe being here at its highest level immediately under the boarding, only one inch from the lead. ' The pipe between C and D would very quickly be melted by the
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