1862 London Exhibition: Catalogue: Class I.: C. E. Crawley
73. CRAWLEY, C. E., 17 Gracechurch Street.
Improved miners' safety-lamp, combining safety with increased light.
This lamp combines several important advantages, viz.,
1st. Without the use of glass it gives from three to four times the light of the common "Davy lamp."
2nd. It never requires snuffing, thus not only keeping the inside of the lamp from getting foul, but giving less trouble to the miner, and at the same time producing a more even light.
3rd. It will, on account of its peculiar construction, consume, while burning with a good flame, from one to two cubic feet of gas per minute (the light being thereby improved), thus tending, though in a small degree, to prevent the accumulation of gas, and so to some extent to lessen the risk of explosion.
4th. Owing to the fact of the gas passing into the lamp principally from below, the wire gauze that covers the flame does not readily become red hot.
5th. It can be instantly extinguished, if required, without trouble; a matter of great importance in case of a sudden irruption of gas.
6th. The lock is very simple, though entirely differing in principle from all others now in use, and is rendered perfectly secure, by means of a seal placed over the lock and completely concealing it, in such a manner as to render it absolutely impossible to open the lamp without breaking the seal, thus forming a perfect detector. This seal consists of a very small thin metal disc, having any kind of device stamped upon it, which could be varied from day to day none but the one authorized person knowing beforehand what seal would be used on any particular day.
7th. The great increase, however, in the light would of itself remove the chief temptation to open the lamp, added to which, it gives, if anything, less light when opened.
8th. It is also, under ordinary circumstances, impossible to light a pipe by drawing the flame through the gauze, as is the case with the "Davy."
9th. Nor, for the same reason, can the flame be driven through the gauze by a current of air; which being the case in the "Davy," has been supposed to be the cause of so many explosions.
10th. There is also another patent improvement in this lamp which will be hailed by the miner as a great boon, viz., an insulated handle, which enables it to be carried at all times without inconvenience, however hot the rest of the lamp may become.
These lamps are made entirely by machinery, and the manufacture is carefully superintended by the patentee, so as to insure perfect accuracy in the fitting of the separate parts, which are very simple, and so constructed, that any part, if accidentally damaged or lost, can be at once replaced without trouble, and at small cost, a stock being always kept on hand for that purpose. Sole manufacturer, C. E. Crawley, 17 Gracechurch Street, London, E.C. Sole agent for Wilson's new Patent Oil Press, and Wilson's new Patent Cotton Press.
Any further information may be obtained in the Exhibition building, where attendance will be given daily, between the hours of ten and four.