RAIRD &.TATLOCK (LONDON) LTD. 



3010 



3010 T Carbon Tube Furnace. Electric resistance furnace (carbon tube type). 



These furnaces are made with carbon tubes from 1.5 centimetres bore by 30 centimetres long, up to 3 in. bore 

 by 18 in. long, for temperatures up to 2,500 centigrade. 



The carbon tube is copper plated at ends and soldered into gun-metal water circulations, which are also 

 arranged as terminals to lead in the current. As shown in illustration, the mounting up of furnace is very simply 

 arranged, the tube being built round with firebricks loosely laid one on the other, the space between filled up with 

 either carborundum or wood charcoal. 



Voltages up to 20, currents up to 5,000 amperes. 



These furnaces may also be arranged to work in vertical position. 



Price, as shown without cable, ij- in. bore by 8 in. long . . 



4 



3011 



301 1 T Electric Resistance Furnaces .. .. .. .. .. .. Price 810 



The illustration represents our standard type of Electric Resistance Furnace, a large number of which have 

 been sold. As now made it is both the cheapest to run and the most efficient on the market, its superiority being 

 largely due to the general design and the special material employed for heat insulation. 



The sizes range from 5 in. flat bottom muffle by 3 in. high by about 10 in. long, and from i in. to 5 in. bore by 

 from about 6 in. to 18 in. long for circular tubes, for temperatures up to 1,200 centigrade. 



For temperatures above 800 centigrade the furnaces are platinum wound ; below this temperature our non- 

 oxidising wire or strip is employed. Wound for any voltage from 50 to 250, and for temperatures from 200 to 

 1,200 centigrade, current consumption for a 2 in. tube 10 in. long, 200 volts, 1,200 centigrade, 3 amperes. 



3012 1 Ditto, wound with special alloy for temperatures up to 900 C. . . . . 6 10 



Prices vary considerably according to voltage and temperature and to the market rate of platinum, and will be 

 forwarded immediately upon receipt of particulars as to dimensions, voltage and temperature required. Supplied with 

 or without regulating resistances. 



CROSS STREET HATTCnST GARDETST, E-C 



572 



w 



