Sundry Papers Relative to an Accident from Lightning at Purfleet, May 15, 1777 . rods be firmly fixed, and clofelyconnected with the lead upon the roofs. 4. That all theftrips and pieces of lead be well fattened and folderedtogether, fo as to make a perfect metallic communica-tion with the bottom of the wells. 5. That the iron rodsbe painted, except in thofe places where they are to bein contact with the lead; that they be all ten feet high; 7 and from Lightning at Purfleet. 317 and that they be terminated with pieces of copper eighteeninches long, like thofe already ere&ed: and, 6. that thefe
Sundry Papers Relative to an Accident from Lightning at Purfleet, May 15, 1777 . rods be firmly fixed, and clofelyconnected with the lead upon the roofs. 4. That all theftrips and pieces of lead be well fattened and folderedtogether, fo as to make a perfect metallic communica-tion with the bottom of the wells. 5. That the iron rodsbe painted, except in thofe places where they are to bein contact with the lead; that they be all ten feet high; 7 and from Lightning at Purfleet. 317 and that they be terminated with pieces of copper eighteeninches long, like thofe already ere&ed: and, 6. that thefecopper terminations be very finely tapered, and as acutelypointed as poffible. We give thefe directions, being perfuaded, that ele-vated rods are preferable to low conductors terminated inrounded ends, knobs, or balls of metal; and conceiving,that the experiments and reafons, made and alledged tothe contrary by Mr. wilson, are inconclufive. J. PRINGLE, P. R, S. March 12, 1778. w. watson. H. CAVENDISH. W. HENLY. S« HORSLEY. T. LANE. MAHON. EDWD. NAIRNE. JOSEPH Sf^
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