The best form of lamp, shown in Fig. 10, may be made by obtaining a small glass kerosene hand lamp, which will cost only a trifle of two or three shillings. Cut off that portion of the burner above the screw, where it is held to the socket that is fastened to the lamp. Remove the tube that holds the lamp-wick and also the little contrivance made to raise and lower the wick. In the place where the tube was inserted, generally a flat one, file out with a round file, a place which is large enough to receive a common brass 44-cartridge that has had the head cut off or removed by filing; this is the tube for the wick. Fasten it in place with soft solder. Let this tube project a little into the lamp, and solder it on the under side. The greater portion of the tube projects above the place where soldered. [Illustration: FIGURE 10.] The wick is made of common cotton wicking, letting the end inside touch the bottom of the lamp. Fill with alcohol, and the lamp is ready for use. Be careful that the wick is not too tight in the tube, or in other words, do not fill the tube with too much wick, as it will prevent the alcohol from rising and the lamp from burning. To prevent evaporation of the alcohol and to have the wick always ready for lighting, cover the tube with a cap that fits it quite closely and has the upper end closed. A brass cartridge that will go over the tube makes a good cover. Remove the primed cap or see that the cap has been exploded before using it to cover the lamp tube. [Illustration: FIGURE 11.] _A Self-blowing Lamp._—A very good form of this lamp is shown in Fig. 11. It consists of a lamp enclosed in a kind of cup which has an open place at the bottom to admit the lamp and a small boiler, fitting loosely, and held by a flange on its top. A small pipe is soldered to the top of this boiler and extends downward, and has an end like a blow-pipe that passes through one side of the cup and ends near or a little above the lamp wick. The operation is as follows: the lamp being lighted, heats alcohol placed in the boiler, and the steam thereby made produces a jet that blows the lamp flame the same as is done with the mouth.