364 Lamp for burning Tallow. 



A, reprefents a cup made in the form of a cone: it contains the tallow, and is fupported, 

 with the point downwards, by the thumb-fcrew /, upon the piece of iron D, which is firmly 

 fixed into the circular wood bottom E. The wideft diameter of this cup is about two inches 

 and a half, and the diameter of a fmall aperture in the point is rather lefs than one-eighth part 

 of an inch. This cup mull be made of iron, brafs, or copper, and the joint on the fide clufed 

 with hard-folder. 



A circular plate of iron is made to lit the wideft diameter, and firmly fixed therein by the 

 fides of the cup being turned over it a little: near one fide of this circular plate, a circular 

 hole lefs than one inch in diameter is made, and into it is fixed the ring d^ which forms the 

 mouth of the cup, and may be clofed with a cork, &c. 



a b reprefents a piece of wire which pafles through a hole made in the circular piece, and 

 through the aperture in the point of the cup. This wire is rather more than one-eighth part 

 of an inch in diameter ; it converges near the point, and exactly clofes the fmall aperture when 

 thruft down: it ferves to regulate the defcent of tallow into the cup B, according to the 

 Quantity confumed by the flame ; and therefore when it is required not quite to clofe the 

 aperture, it is draw n up a little, and a fmall fpring of brafs, in the infide of the cup at. C, 

 prefles againft it, and holds it in the place. The fpring paflTes through the circular plate, 

 and is fixed on the outfide by a fmall fcrew. 



B reprefents a fmall cup, in which the tallow is burned : it is about one inch in diameter, 

 and about half an inch in depth. Into the bottom of this cup is foldered the tube f, which 

 •is about two inches and a half long, and Aides into the tube g, which is foldered into the bot- 

 tom of the cup c. 



e reprefents a piece of bended wire, which fupports the wick of the lamp. The ends of 

 this piece of wire are thruft into a piece of foft wood, fitted into the tube/. Another tube, 

 reprefented by h, is foldered to one fide of the cup B, above the brim: the ufe of this tube 

 is to contain a quantity of clean wick, and to ferve for a handle to lift the tube/out of the 

 focket g when the lamp is to be lighted. 



C reprefents a cup to receive anjr tallow that may chance to run over the fides of the cup 

 B. It is rather more than one inch deep, and two inches in diameter. 



Laftly, by the help of the thimb fcrews / /, the height of the cups B, C, and A, and the 

 diftance between B and A, my be regulated at pleafure. 



A wick of cotton being put into the tube h., and brought through the ring e ; a quantity 

 of tallow put into the conical cup; and the fmall cup filled with melted tallow ; the lamp may 

 be lighted : if the point of the cup A be raifed two or three inches above the brim of the 

 cup B, and the air in the room at reft, the tallow in the cup A will be fufed in a few 

 minutes, and if the wire « ^ be properly adjufted, a conftant fupply of tallow will drop to the 

 flame. 



Small particles of duft and other impurities in the tallow fometimes impede the drops, 

 but the light continues undimimflied, until all the tallow in the little cup is confumed, and 



the 



