DE KHOTINSKY TRIPLE WALL INCUBATORS 



INACTIVATING OVENS AND PARAFFINE BATHS 

 ELECTRICALLY HEATED AND REGULATED 



with 



New Bimetallic Thermo-Regulator 



and with 



New System of Ventilation 



(Patented) 

 Providing Uniform Temperature Throughout Incubating Chamber 



No. 7890 



Made in Three Sizes 



These new incubators have been designed to provide instruments for incubating and inactivating work of 

 the most exacting character. 



All who have worked with the usual type of electrically heated incubators have experienced the difficulties 

 inherent in the ordinary thermo-regulator with its relay continually sticking and causing the temperature either to 

 rise or fall and ruin valuable cultures. OUR NEW BIMETALLIC THERMO-REGULATOR operates to break 

 the circuit directly without the necessity of a relay. It is sensitive, dependable, not aflfected by external distur- 

 bances and practically free from lag. 



The usual type of electric incubator has a wide difference in temperature between the top and bottom , so 

 that only one shelf can be used for culture work. Various methods have been devised to overcome this variance in 

 temperature, but without great success. OUR NEW SYSTEM OF NATURAL VENTILATION was worked out 

 after long study and experimentation, and as a result, we have succeeded in reducing the difference in temperature 

 between the top and bottom shelves of our incubators to a small fraction of a degree. 



In addition to these two features, peculiar to the De Khotinsky. Triple Wall Incubators, the construction is 

 new and entirely different from other types on the market. 



For full description and prices, send for circular No. 63 B 



CENTRAL SCIENTIFIC COMPANY 



(Lake Shore Drive, Ohio and Ontario Streets) 

 460 East Ohio Street CHICAGO, U. S. A. 



