DISTILLATION Si 



tion, evaporation, desiccation, &c., on the small scale, by the heat of a gas-furnaco. 

 Fig. 618 represents this apparatus. 



B, a burner supplied with gas by a flexible tube, c, the boiler or still, i, an 

 evaporating pan, fixed over the boiler and forming the top of the still-head, x, a 

 valve for shutting off the steam from i, when it passes through the tube M, otherwise 

 it would pass through L, and communicate heat to the drying-closet o o, and from 

 thence to the condenser T T. o is a second evaporating pan over the drying-closet. 

 Another arrangement for distilling by steam is shown in fig. 619. 



^Sometimes also distillation is effected by passing hot steam through a worm con- 

 tained within the still, instead of, or in addition to, the application of heat from 

 without. 



The worm or condenser is frequently constructed of earthenware, and set in an 



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