

BAIRD &TATLOCK (LONDON) LTD. 



2926-2930 

 Double Muffle Furnaces (draught), for assaying, hardening, case-hardening, tempering, etc. 



This arrangement of double muffle furnaces is heated by only one set of burners, which, without loss of heat 

 in the bottom muffle, or increased consumption of gas, will maintain in the top muffle a temperature of approxi- 

 mately 300 F. below that of the bottom one. 



The body is erected with strong cast-iron casing, lined inside with non-conducting material, inside which the 

 fireclay body of the furnace is built. All parts of the furnace are easily detachable. 



These furnaces are specially suited for hard daily use where absolute precision and reliability are required, 

 though where it is necessary to maintain exact temperatures for long periods, the use of a good gas pressure governor 

 with one of our dial-indicator gas taps (designed specially for fine adjustments of gas supply) is recommended. 

 See Nos. 2931-2937. 



Lifting counterbalanced door, or loose stoppers, supplied in place of hinged doors, if ordered. 



Two fireclay muffles, four fireclay trays, or one muffle and two trays supplied with each furnace. 



Cast-iron muffles can be supplied to all sizes, silica muffles for Nos. 2926 to 2929 only. 



With all classes of work in which it is not absolutely necessary to protect the contents of the furnace from the 

 products of combustion, a considerable saving in gas consumption can be effected by substituting a tray in place 

 of the muffle, thereby forming what is commonly known as an oven furnace. For most classes of work for which the 

 oven furnace is suitable, a saving of 25% in gas consumption is effected by this means, and also the cost in renewals 

 of trays is considerably less than that of muffles. 



CROSS STREET HATTOTST GARDETST, E-C 



