De Khotinsky 



Electrically Heated and Regulated 

 Constant Temperature 

 Heating Appliances 



We are pleased to announce that we have taken over the manufacture and sale of 

 the above appHances, which were designed and have been placed on the market by 

 Achilles de Khotinsky of the University of Chicago. In all the features which go to 

 make up a successful line of electrically heated and regulated drying ovens, incubators, 

 hot staining apparatus, and water baths, the de Khotinsky line is unsurpassed, and 

 we are prepared to recommend it without reserve. We describe below one item only 

 of the line. 



No. 5601 



Electrically Heated Water Bath 



This bath consists of a copper container ^ mm. thick, lagged with 25 mm. of magnesia-asbestos 

 and protected outside by Russia sheet iron. The bath is attached to an enamel cast-iron base, fitted 

 with a nickel plated supporting rod. The top of the bath is fitted with a set of seven porcelain rings 

 to accommodate the did'erent sizes of flasks or evaporating dishes. 



Four electric heating units of 45 watts each are used, which may be added one by one, by 

 means of the switch which constitutes a part of the bath, and the desired temperature thus secured. 



The bath has a constant water level attachment, so that the water level may be kept constant 

 at anv point within a range of 25 mm. The regularity of the water level is 1 mm. Capacity of bath 

 ICOO cc. 



As the heating units are inserted in brass tubes placed permanently inside of the baths, 20 mm. 

 from the bottom, their heating value comes to 99% of the theoretical expenditure of energy. Placed 

 as they are, the heating units are absolutely protected from accidental injury. To replace these units 

 takes no more time or skill than to replace an incandescent lamp in its socket. 



This bath operates on either a direct or alternating current of 110 \olts, and may be attached 

 to any lamp or Hubbell socket. Complete with four heating units, but without flash, (P'^C f\f\ 

 clamp, or condenser Net «P^»).UU 



CENTRAL SCIENTIFIC COMPANY 



412-420 Orleans Street 



(After May 1, 460 East Ohio Street) CHICAGO, U. S. A. 



