DESCRIPTION OF THE APPARATUS. 



19 



\ 



.-taiid is !)| inches, which raises the hottoiu ol' the eoiuleiiser lank 8f 

 inches above the work table, leavinir ample room for the S-ineh meas- 

 uring flasks {t)to be placed 

 under the condenser tubes. 

 The corners of the stand 

 are strengthened by the 

 braces (r). The cross 

 piece (iv) at the back of 

 the stand is dropt 4 or 5 

 inches in order to facili- 

 tate the manipulation of 

 the burners. 



Between the burners (x) \ 

 and the gas pipe (?/) is in- 

 serted an extra stopcock 

 {x'). AVith the extra 

 stopcock directly beneath 

 the burners the flow of 

 gas can be regulated l)y 

 setting either the valve in 

 the burner (x) or the stoj)- 

 cock («0? rising the remaining one for tm-ning on and off the gas. 

 (Figs. 3 and 5.) The gas pii)e (i/) with the attached burners can be 

 raised or lowered by loosening the nuts {s) at the slotted supports 

 (yO at either end of the stand. 



^■ 



.^ 



y 



iU 



evaporatinff chamber, showing the ijositioii of the tri- 

 angle over the gauze. 



THE DISTILLATION FLASKS. 



The flasks (figs. 4 and 5, p^ in which the mixture of corn and oil 

 is heated are primarily distillation flasks having short necks and 



specially constructed side tubes. 

 (Fig. lb.) 



The flasks have a capacity of 

 approximately 1,000 cubic centi- 

 meters. The necks of the flasks 

 have a diameter of 2i centime- 

 ters and are made Avithout a 

 flange and sufficiently heavy to 

 stand tight corking. The side 

 tube, W'hich is 7 or 8 millimeters 

 in internal diameter, is insert- 

 ed approximately 3 centimeters 

 from the top of the neck. The 

 respective lengths of the three arms of the side tube are 6|, 7. and 

 3 centimeters. The bend between the two long arms is 1^ centi- 



99 



Fig. 10.— Distillation flask. 



