BAtRD &TATLOCK (LONDON) LTD. 



3453-3455 



3453-3455 (Section) 



Automatic Bunsen Burners for Methylated Spirit. 



Each burner, complete, consists of reservoir with tap, flexible metallic tubing 5 feet long, iron 

 tripod, pricker, and coarse and fine wire gauzes. 



3453 Flame about 5 in. long, equal to one bunsen burner. No. 14 



3454 Flame 8 in., equal to two gas bunsen burners. No. 15 . . 



3455 Flame io| in., equal to four gas bunsen burners. No. 15^ 



3456 Star Burners, to suit Nos. 3454-3455 . - each 



No. 3453 consumes about 4 oz. spirit per hour. 

 No. 3454 8 oz. 



No. 3455 10 oz. 



INSTRUCTIONS. 



Join one end of the flexible metallic tubing to the reservoir, and the other end to the bunsen burner. Fill 

 the reservoir with methylated spirit, about if pints, and hang it up a yard above the bench or table (not higher). 

 To light the buusen burner, first open the tap underneath the reservoir, give the methylated spirit time to fill 

 the flexible tube, then give the regulating screw (r) of the burner half a turn to the left, and let some spirit over- 

 flow into the saucer till same is about one- third filled. Then close the regulating screw, light the spirit in saucer ; 

 this having burnt out, open the regulating screw and light the spirit-vapour escaping at the mouth of the burner. 



When the spirit in the saucer has been lit, any spirit remaining in the parts of the burner this side of the 

 regulating screw will give a large flare, which will quickly disappear. When the burner is first lit the flame will not 

 at once burn quite steadily, but will soon be perfect. Such unsteadiness must not be mistaken for the irregular 

 yellowish flame which appears if the burner has not been sufficiently warmed up ; in the latter case, turn the 

 flame down a little till the burner is sufficiently heated and vapour forms steadily. 



REGULATION. 



By the regulating screw the flame can be regulated large or small, but the flame should never be smaller 

 than 1 1 in. After continued use the wire gauze, which should always rest on the four spikes inside the tube, 

 must be renewed. For a stronger flame a wider mesh gauze should be taken. 



CLEANING THE BUNSEN BURNER. 



The methylated spirit will, in the course of time (500 to 1,000 hours' use) clog the passages in the handle 

 (h) and the body (m), also occasionally the nozzle of the burner (d) and valve (c). The flame will thon burn 

 one-sided or irregularly and too short. Use the pricker, which accompanies each burner, for pricking out the 

 nozzle, but never use other instruments, such as pins, needles, etc., for if the nozzle is widened the burner cannot 

 act properly. It will be necessary occasionally to unscrew the burner to clean the valve (c), and to take out, 

 clean, and replace the wires in passages (h) and (m), as these, wires serve to collect the impurities contained in 

 the methylated spirit. When cleaning, it is necessary to take care that none of the wires are lost, and that the 

 whole number of wires are replaced in the original position. The asbestos packings of the valve must be renewed 

 when worn. All the parts must be screwed up vapour-tight, so that the vapour cannot escape except at the 

 nozzle of the burner. 



N.B. As the flame of this bunsen burner is of considerably greater heat than that of the gas bunsen burners, 

 it is necessary, when heating vessels over wire gauze, to use iron wire gauze ; brass will fuse. 



1 1 



1 10 



1 17 6 

 



CROSS STRET HATTO^NT GARDE1ST, E-C 



648 



