196 



CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. A. 



Nos. 4126-7. (Patent Pending). 



Sectional Diagram Showing Details of Construction. 



4126. 

 4127. 



DISTILLING APPARATUS, Cenco Polar, Electrically Heated. This still has been scientifically 

 designed and carefully constructed in accordance with well established engineering principles 

 relating to the efficient evaporation and condensation of water, and possesses certain features 

 not found in other stills. 



The condenser has no tubes to become limed up or leaky but consists of three concentric cyl- 

 inders; the outer one forming the jacket of the still is cooled by radiation, while the inner 

 two are cooled by a constant stream of water circulating between them in a spiral motion. 



The boiling chamber is designed to maintain a small volume of water at constant level, spread 

 out to afford as large a surface as possible for evaporation. 



The vapor flue, through which the steam from the boiling water ascends, is high and wide, 

 preventing any carrying over of impurities due to foaming or bursting of bubbles, or to the 

 velocity of the vapor. 



The steam separator at the top of this flue efficiently separates the dry vapor from the liquid 

 particles, rolling them back into the boiler. 



The high temperature of the cooling water from 160 to 180F. which is made possible by 

 the large area of condensing surface, effectually cooks out of the raw water any odors or 

 dissolved gases, which pass out through vents in the cover of the still. This hot water is 

 slowly fed to the boiler as required and consumes but little heat in bringing it to the boiling 

 point. 



The heaters are of the well known Westinghouse Bayonet type, designed for greatest efficiency. 



The interchangeable base makes it possible to lift out the top part of the Cenco'Polar Still and 

 set it in another base, equipped for gas or steam heat. This is a feature peculiar to the 

 Cenco Polar Still. All parts of the still are easily accessible for cleaning, as the still can 

 be taken apart without difficulty and can be set up when received with equal ease. 



The heat exchange, just above the outlet for distilled water, reduces the temperature to within 

 a few degrees of that of the room. By throttling down the supply of cooling water, distilled 

 water at any temperature up to 200F. can be obtained. The coil of block tin pipe, through 

 which the distilled water passes on its way through the heat exchange, is surrounded by the 

 cold condensing water just as it enters the still from the tap; consequently there is no oppor- 

 tunity for vapor to escape. 



An aerator can be supplied at a small additional charge when it is desired to use the distilled 

 water for drinking purposes. 



Complete as described, constructed throughout of cold rolled copper heavily tinned, with West- 

 inghouse Bayonet Heaters, attachment cord and three-heat switch for use on either A.C. or 

 D.C. circuits. Sizes A to C are nickel-plated outside; D to F are furnished in burnished cop- 

 per. All stills are furnished on flat base as illustrated, but may be had mounted on legs with- 

 out extra charge if specified when ordering. Wall brackets are furnished for attachment to 

 the wall at a small extra charge as listed below. With full instructions for setting up and 



operating. No A B C 



Capacity, gallons per hour 1 2 3 



Height, inches 12 13% 15 



Diameter, inches 10 11 12 



For 110 volts $80.00 125.00 225.00 375.00 



For 220 volts 87.50 132.50 235.00 375.00 



D 



5 

 20 



E 



10 



28 



15 



700.00 

 700.00 



F 



15 



32 



18 



900.00 

 900.00 



