Fig. 1. represents a wire gauze safe-lamp of exactly half the length and breadth of a working lamp.
A. the cistern which contains the oil.
B. the rim in which the wire gauze cover is fixed, and which is fastened to the cistern by a moveable screw.
C. an aperture for supplying oil, fitted with a screw or a cork, and which communicates with the bottom of the cistern by a tube.
D. the receptacle for the wick.
E. a wire for raising, lowering, or trimming it, and which passes through a safe tube.
F. the wire gauze cylinder, which should not have less than 625 apertures to the square inch.
G. the second top ¾ of an inch above the first.
H. a copper plate, which may be in contact with the second top.
I. I. I. I. thick wires surrounding the cage to preserve it from being bent.
K. K. are rings to hold or hang it by.