BAIRD &TATLOCK (LONDON) LTD. 



2890 



Perfected Injector Furnace, for metallurgists, jewellers, chemists, manuiacturers of arti- 

 ficial gems, and other purposes. Works equally well with coal gas or air gas. 



POWER AND SPEED OF WORKING. 



With J-in. gas pipe and the smallest foot blower, the smallest furnace will melt a crucible full of cast-iron scrap 

 7 minutes, tool steel in 12 minutes, and nickel in 22 minutes, starting with all cold. With a foot blower No. 



No. 2025, cast-iron can be melted in any furnace up to 12-lbs. size, tool steel or nickel in any up to the 6-lb. size ; 



essemer or gun steel in the smallest size. For higher powers or large furnaces a Roots' No. 2033 or Lennox No. 



o2g blower, driven by power, is necessary, and the air jet must be enlarged to about double the size which can 

 used with a foot-blower. 



For the fusion of pure nickel over 6 Ibs. at once a small power blower is necessary, and the air jets of the 

 burners must be enlarged to double the size. The air supply of the 28-lb. size must be controlled if necessary 

 J3y a valve or large tap. 



Gas supply required 6 oz. size furnace f in. pipe = 7 to 

 2 Ib. f ,, = loto 



61b. } = 25 to 



12 Ib. = 30 to 



28 Ib. i 



30 ft. of gas per hour. 

 40 ft. 

 60 ft. 

 70 ft. 



ij ,, = ioo to 300 ft. 



All internally fired casings crack the first time they are used, but should not alter afterwards. 



