Lightning, Thunder and Lightning ConductorsMolloy, Gerald
Science
Lightning, Thunder and Lightning Conductors
Molloy, Gerald
Lightning; Lightning conductors; Thunderstorms
I will give you some recent and striking examples. In the month of May,
1879, the church of Laughton-en-le-Morthen, in England, though provided
with a conductor, was struck by lightning and sustained considerable
damage. On examination it was found that the lightning followed the
conductor down along the spire as far as the roof; then, changing its
course, it forced its way through a buttress of massive masonwork,
dislodging about two cartloads of stones, and leaped over to the leads
of the roof, about six feet distant. It now followed the leads until it
came to the cast-iron down-pipes intended to discharge the rain-water,
and through these it descended to the earth. When the earth contact
of the lightning conductor was examined, it was found exceedingly
deficient. The rod was simply bent underground, and buried in dry
loose rubbish at a depth not exceeding eighteen inches. This is a very
instructive example. The lightning had a choice of two paths--one by
the conductor prepared for it, the other by the leads of the roof
and the down-pipes--and, by a kind of instinct which, however we may
explain, we must always contemplate with wonder, it chose the path of
least resistance, though in doing so it had to burst its way at the
outset through a massive wall of solid masonry.[31]
On the 5th of June, in the same year, a flash of lightning struck the
house of Mr. Osbaldiston, near Sheffield, and, notwithstanding the
supposed protection of a lightning conductor, it did damage to the
amount of about five hundred pounds. The lightning here followed the
conductor to a point about nine feet from the ground, then passed
through a thick wall to a gas-pipe at the back of the drawing-room
mirror. It melted the gas-pipe, set fire to the gas, smashed the
mirror to atoms, broke the Sevres vases on the chimney-piece, and
dashed the furniture about. In this case, as in the former, it was
found that the earth contact was bad; and, in addition, the conductor
itself was of too small dimensions. Hence, the electric discharge
found an easier path to earth through the gas-pipes, though to reach
them it had to force for itself a passage through a resisting mass of
non-conductors.[32]
Public-domain text, read in full here on John Shaqi.
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