BAIRD &TATLOCK: (LONDON) LTD. 



Furnace with draught arrangement, external view. 

 2964 (Fig. i) 



2964 Muffle Furnace with Burner. 



No. 



Space inside muffle 



Price, for draught only 



Extra muffles, clay 



salamander 



Extra grids for burners 

 gauzes 



2965 

 2966 

 2967 

 2968 



Furnace with draught burner, showing internal arrangerr 



2964 (Fig. 2) 



261 461 661 



2 by 2 by 4 3% by 3 by 6J 5f by 4* by 9 in. 



40/- 45/- 80/- 



9d. 1/6 2/6 each. 



1/6 3/- 5/- 



21- 2f- 2\- 



lOd. lOd. lOd. 



INSTRUCTIONS FOR MUFFLE FURNACES, Nos. 261, 461, and 661. 



The gas supply tap and pipe must be large and clear, so as to give as great a pressure of gas as possible at the 

 burner nozzle, although the actual consumption of gas is small. The indiarubber tubing used must of necessity 

 be perfectly smooth inside. The tubing made of wire, whether the wire is removed or not, will not work these 

 burners satisfactorily. All muffle furnaces are sent out with a 2 ft. 6 in. chimnej 7 , having a cast-iron foot to enable 

 it to stand steadily, and a short handle by which it can be readily lifted with the crucible tongs. The gas supply 

 specified is required to work each furnace at its full power, and the flame must be visible in the chimney. If the gas 

 supply is deficient, the furnaces can be worked at a lower heat by partially closing the top of the chimney until the 

 flame becomes visible, or by working without chimney. If the burner plate becomes red-hot, it is a sign that the 

 gas supply is deficient. The points of blue flame are always visible when the burner is looked into sideways, unless 

 the gas supply is too small to work the furnace satisfactorily. To light the burner without removing the upper part 

 of the furnace, put a lighted taper through the burner casing up between the grooves in burner plate, then turn the 

 gas on, slowly. If the furnace is hot it may be necessary to cover the air opening round the gas entrance to prevent 

 the flame descending through the gauze at the moment of lighting. The burners can be easily taken apart, and 

 must be kept clean. 



See also Assay Section at end of Catalogue. 



CROSS STREET HATTCTK GARDEN, E-C 



566 



