LAMPS 



37 



top at a, and another at the bottom b ; between the upper rim and the margin there 

 is a small projecting pin c, which, when the whole apparatus is combined, fits into the 

 cavity e of the collar i. To prepare the lamp for use, the tube H is placed between A 

 and B, as just described ; the ring F, with its charge of cotton, is next inserted, the 

 pin in the inside falling into the spiral groove, and that on the outside entering the slit 

 in the tube H, which, on being turned about, moves the ring F down upon the screwed 

 inner tube, until the wick only just rises above the superior edges of the tubes, in the 

 interval between which it lies in the oil. In this stage the frame i is placed on the 

 nick in the collar at e, falling upon the pin near the top of H ; the lower disc / g, 

 passing over the tube A, at once presents a convenient support for the glass chimney, 

 and a finger-hold for raising the wick. The central tube is open throughout, com- 

 municating, at its lower end, with the brass receptacle K ; the latter is perforated at 

 top, to admit the air which, by circulating through the above tube, and the hollow 

 flame which surrounds it, causes the lamp to burn with that peculiar freedom and 

 brilliancy which distinguish the Argand construction. This last-mentioned receptacle 

 likewise catches any small quantity of oil which may pass over the inner tube during 

 the combustion of the wick. L is the brass peg, which fits into the upper part of the 

 pilkr, in the table-lamp. 



1313 



1314 



In addition to the endless variety of small portable lamps, the peculiarities of 

 which it would be tedious to particularise, and the merit of which, as compared witt 

 those on the Argand principle, consists, for the most part, m their cheapness, tn< 

 more important articles, and those generally in demand, may be distinguished as to 

 or bracket lamps, supended or chandelier lamps, and table or French lamps; 

 having burners on the principle above described. The former sort were, previoi 



