LABORATORY SUPPLIES AND CHEMICALS 



165 



HOSMNS ELECTRIC 

 COMBUSTION FURNAC*" < 



2916(h) FURNACE He-skins' Electric (Type FB 302). Tube chamber style. (See gen- 

 eral description under Type FB). 



Furnace and Complete 

 Transformer Equipment 



Type and Size of Heating Furnace 



Number Chamber Only Rheostat 60 cycle 25 cycle 60 cycle 25 cycle 



FB-302 1*4" dia. x 11" long $30.00 12.00 26.00 40.00 68.00 82.00 



2916(j) FURNACE, Multiple Tube Combustion Furnace (Type FB-235). This furnace 

 is of great convenience and economy where a large number of carbon 

 determinations are to be made, using the direct combustion method. Five 

 carbon combustions can be run simultaneously, and in approximate terms, 

 at one-fifth the attention, one-third less space and correspondingly lower 

 up-keep cost than that represented by five single tube furnaces of the 

 same capacity. 



The combustion tubes are heated by direct radiation from the "hair- 

 pin" heating units, between which the tubes lie. Temperature regulation is 

 accomplished by means of a regulating transformer. This furnace is also 

 made in the FD type. See No. 2916(e). 



Furnace and Complete 

 Transformer Equipment 



Type and Size of Heating Furnace 



Number Chamber Only Rheostat 60 cycle 25 cycle 60 cycle 25 cycle 



FB-235 5 holes, 1J4" d. x 12" 1. $125.00 None 157.50 197.50 282.50 322.50 



2916(k) 



2916 (k) FURNACE CORES, Alundum. For the construction of small wire resistance 

 electric furnaces Alundum refractory cores meet the criteria of the most 

 efficient material for this purpose. The resistor should be spiralled and 

 wound and then embedded in Alundum cement. Thus, fully protected, the 

 wire does not corrode under the most severe conditions, since the Alundum 

 mixtures are chemically inert. In addition to this the core has high heat 

 conductivity and does not become an electrical conductor even at the 

 highest temperatures obtained in the furnace.* 



Those listed below we aim to carry constantly in stock. Special sizes 

 and styles made to order. 



No 6917 



Bore, inches 1 



Depth, inches 10 



Pitch, inches 1/9 



Each $3.75 



*One end closed. 



