so Sir Humphry Davy on thefire-damp of coal mines, and on 
Explanation of the Plate, 
Plate I. 
Fig. l. Represents the safe lantern, with its air-feeder and 
chimney furnished with safety metallic canals. It contains 
about a quart of air. The sides are of horn or glass, made 
air tight by putty or cement. A. is the lamp through which 
the circular air-feeding canals pass : they are 3 concentric 
hollow cylinders, distant from each other of an inch : the 
smallest is 2-5- inches in circumference ; their depth is 2 inches. 
B. is the chimney, containing 4 such canals, the smallest 2 
inches in circumference : above it is a hollow cylinder, with 
a cap to prevent dust from passing into the chimney. C. is 
the hole for admitting oil. D. is a long canal containing a 
wire by which the wick is moved or trimmed. E. is the tube 
forming a connection between the reservoir of oil and the 
chamber that supplies the wick with oil. F. is the rim round 
the bottom of the lantern to enable it to bear motion. 
Fig. 2. Is the lamp of Fig. 1., of its natural size, the re» 
ferences to the letters are the same. 
Fig. 3. Is a common chimney which may be used in the 
lantern ; but the safety chimney doubles security. 
Fig. 4. Exhibits the safety concentric canals or fire sieves, 
which if -V of an inch in diameter, must not be less than 2 
inches in exterior circumference and 1.7 inch high. 
Fig. 5. Exhibits the longitudinal safe canals or fire sieves. 
Fig. 6. Exhibits a safe lamp having a glass chimney covered 
with tin-plate, and the safety apertures in a cylinder with a 
covering above: the lower partis the same as in the lantern. 
