1868 The complete Practical Distiller

CONTINUOUS DISTILLATION.

51

Here it is not necessary to describe the ^ell-

ascertained.

known graduated bubble. Another improvement made on this is to cause the liquid operated upon in the pro- cess of distillation to flow gradually over the heated sur- face of the boiler while it continues to give out its spi- rituous evaporation. The quantity of liquid allowed to be acted upon, or to pass through the still in a given time, and also its velocity, is regulated by the circuitous route in which it proceeds ; and by that means the com- plete operation of the fire upon the whole fluid is insured, without impeding or clogging the spirituous evaporation by aqueous or empyreumatic vapours. By this construction of a still, a continued and unin- terrupted distillation, boiling, or evaporation is carried on as long as the supply of liquid is furnished and the fire kept up.

Fig. 6.

In fig. 6 is a view, in profile, of the section of a still or boiler made on the improved principle, of copper or any other suitable material; and fig. 7, on the following page, is a plan of the same.