In the most complete forms of apparatus used to-day, there is a variation of this construction. The first runnings, middle runnings and the last runnings are each led off from the main column to separate coolers, condensers, etc., and the purified result from each of these columns is in turn led to a trunk rectifier common to all where the product is redistilled and entirely freed from impurities. This gives a very high grade of alcohol by a process practically continuous. At the same time the impurities are not returned to the first or main column to contaminate the vapors therein and add to the amount of fusel oils contained on the lower plates. In construction of this character there is a very large saving in the cost of the fuel and the result is much better in every way. [Illustration: FIG. 40.--Gillaume's Rectifier and Inclined Still.] FIG. 40.--GUILLAUME'S DIRECT DISTILLATION-RECTIFICATION APPARATUS FOR "AGRICULTURAL" DISTILLATIONS. _A_ Distilling Column. _a_ Tank for Wash to be Distilled. _b_ Cold Water Tank. _C_ Rectification Column. _D_ Final Purification Column. _I_ Wash Heater. _K_ Condenser. _K¥_ Refrigerator of Ethers. _O_ Refrigerator for high-grade Alcohol and the First Runnings. _Q_ Refrigerator for the Products of the Last Runnings. _R_ Spent Wash Extractor. _r_ Siphon Carrying off Spent Wash. _S_ Steam Regulator. _s_ Tap and Pipe for Carrying Wash to Distilling Column. _U_ Water Regulator. _u_ Taps for the Extraction of Intermediate Impurities. _V_ Receiver Accumulator. _v_ Tap for the Extraction of the Last Runnings. _X_ Test Glass for the High-Grade Alcohol. _Y_ Test Glass for First Runnings. _Y¥_ Test Glass for Last Runnings. _Z_ Test Glass for Determining Degree of Exhaustion of Spent Wash. In this apparatus the still proper is of the form heretofore described on page 78. The liquid to be distilled enters at the top of the inclined column _A_ and descends to the base thereof. The alcoholic vapor rises through the column and passes off from the head thereof into the rectifying column. At the head of the column _A_ it has a strength of about 40∞ to 50∞ F. The column _C_ is supported upon an accumulating reservoir _V_ which acts to regulate the flow of the phlegm through the rectifying column and prevents too great an exhaustion of the plates of the column. It acts as a reservoir to contain any excess of phlegm or to supply an additional amount of phlegm to the plates when they have become nearly exhausted.