The Great Exhibition

It is well known that the vineyards of Switzerland have been long protected from hail by means of upright poles having copper wire attached to them, termed "paragrêles," distant from each other from 60 to 100 feet. The formation of hail is an effect of which electricity is the cause, and the cloud being deprived of this agent by the conductors, descends in the shape of rain. Mr. John Murray, F.S.A., F.L.S., &c., in his work on Switzerland, speaks very decidedly of their utility. Has then this ingenious contrivance been considered with reference to the protection of the Great Exhibition and its…