rie 



CENTKAL SCIENTIFIC CO., CHICAGO, U. S. A. 



14300. 

 14301. 

 14302. 

 14303. 



WATER BATH, DeKhotinsky, Electrically Heated and Regulated (Patented), intended for use 

 in modern chemical, physical and bacteriological laboratories, where constant temperature is 

 imperative. It consists of a copper container % mm (1/32 inch) in thickness, heavily nickel- 

 plated inside and out, lagged with 25 mm (1 inch) magnesia-asbestos (magnesia 85%), and pro- 

 tected outside by a sheet of Russia iron. The bath is attached to an enameled cast-iron base, 

 supplied with three nickel-plated rods, to which may be attached laboratory clamps for sup- 

 porting flasks, etc. Each bath is fitted with four electric heating units, three of which may 

 conveniently be added one by one, by means of the switch constituting part of the bath. The 

 fourth unit is electrically connected to the relay, which is automatically operated by a thermo- 

 regulator. 



The thermo-regulator consists of a solid drawn-steel tube, brass covered, nickel-plated, filled 

 with mercury, with a platinum contact attached to a regulating cap, by means of which the 

 bath can be regulated and set to the desired temperature, ranging from the temperature of the 

 surrounding atmosphere to the boiling point of water. Should a temperature higher than the 

 boiling point be needed, the water may be replaced by Crisco, which can be used up to a tem- 

 perature of 165 C., or even higher. For temperatures within 2 degrees of room temperature 

 and lower, No. 14306 Cooling Coil must be used. With this bath, when provided with a No. 

 12864 High Speed Turbine Stirrer, the temperature can be held constant to 1/10 degree C., 

 over long periods of time. 



A constant water level attachment is furnished with each bath, by means of which the water 

 level can be regulated within a range of 35 mm (IVi inch) and maintained within 1 mm of the 

 level at which it is set. This bath has a very good natural circulation, as heat is supplied in- 

 side the bath 25 mm from the bottom. When experiments or research demand a more vigorous 

 circulation and regulation closer than 1/10 C., a small High Speed Turbine Stirrer No. 12864 can 

 be attached to the bath. This stirrer of 18 mm diameter takes water from the bottom of the bath 

 at the rate of five liters per minute, and delivers it at the top with an energy expenditure in 

 the motor of 15 watts. On the shaft of the circulation turbine is an extra pulley to connect 

 with the glass stirrer in the flask. Complete with water bath, four heating units, relay, thermo- 

 regulator, constant water-level device, support rods, five feet of cord and attachment plug. If 

 uniformity of temperature throughout bath is desired, stirrer should be included. 



No A 



Capacity, liters 9.3 



Diameter inside, cm 25 



Available height inside, cm 19 



For 110 volts A. C $75.00 



For 220 volts A. C 77.50 



For 110 volts D. C 72.50 



For 220 volts D. C 75.00 



Note: In ordering state mean temperature desired, so that heating units of correct wattage may 

 be furnished. 



B 



18.25 

 30.5 

 25 



98.50 



101.00 



96.00 



98.50 



