1851 Great Exhibition: Official Catalogue: Class V.: Edward Alfred Cowper
699. COWPER, EDWARD ALFRED, 9 Kensington Park Road, Notting Hill — Inventor.
Detonating fog and accident signal for railways. It consists of a small flat tin box about two inches in diameter, with a slip of lead soldered to it to fasten it to the rail. It is filled with gunpowder, and contains a match which takes fire when crushed.