DURHAM AND NORTHUMBERLAND. 113

I have omitted giving a figure on the originalplan, but present a sketch upon the improvedconstruction.

Plate VI. Fig. 1, represents the lamp asit now is ready for use.

A, the body of the lamp, constructed ofcopper or block tin.

JS, a conical tube which carries off the air(deprived of its oxygen by combustion) throughthe water in the cistern C.

D is a cistern containing water to keep thelamp cool if necessary.

E, the window of the lamp made of verythick glass.

F, the candle supported upon a tin stand.

G, a cistern containing water through whichthe air is forced by the bellows.

H, a tube from the bellows which conveysair for supporting the combustion of thecandle.

An elastic tube may be fixed to the valve ofthe bellows in case of necessity, by which todraw atmospheric air from any distance to sup.ply the lamp.

No other invention whatever can equal the se-curity of this lamp ; and although others maybe more applicable, from the necessity of havinga person required constantly to work the bet-