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



283 



No. 6744. 



6744. GAS BURETTE, Hempel's. with compensating tube to correct for variations in temperature 



and pressure. Complete with stop-cock and leveling bulb, mounted on weighted metal bases, 

 as illustrated $20.00 



6745. GRADUATED BURETTE only of No. 6744, with three-way stop-cock 7.00 



6746. LEVELING BULB for No. 6744, mounted on heavy base 3- 50 



6747. GLASS BULB only of No. 6746 1-00 



6750. GAS BURETTE, Hempel-Tutweiler, with four-way stop-cock, compensating tube, manometer, 



water jacket, and leveling bulb, mounted on heavy metal bases 22.00 



6751. GRADUATED BURETTE only of No. 6750, with special four-way stop-cock 10.00 



6754. GAS BURETTE, Hempel's, modified by the Illinois Steel Company, with burette graduated to 



100 cc in 14 cc divisions, three-way stop-cock, and water jacket, without support 8.00 



6755. GRADUATED BURETTE only of No. 6754, with special three-way stop-cock 6.00 



3770. 



6771. 

 6914. 



GAS CALORIMETERS AND ACCESSORIES 



GAS CALORIMETER, Parr's. This calorimeter measures the calorific value of any gas by burn- 

 ing under identical conditions the unknown gas along with a standard gas of known composi- 

 tion, so that equal volumes of both under equal pressures and temperatures impart their heat 

 to equal volumes of water. The heat values, therefore, are in direct proportion to the read- 

 ings of the two thermometers. Thus all metering of the gas is avoided, it being necessary only 

 to maintain exact equivalents or multiples by means of the calibrated gas holders. Complete 

 as illustrated, with automatic generator for standard gas (pure hydrogen), electric motor for 

 driving the stirring apparatus, two angle thermometers with reading lenses, pilot lamp, gravity 

 tank, one 2-pound can of Hydrone and instruction book. (See Journal of Industrial and Engi- 

 neering Chemistry, Vol. H, No. 8, for August 1910, page 337) 325.00 



EXTRA THERMOMETERS, angle form, for No. 6770 each 12.00 



HYDRONE for No. 6770, in 2-pound cans each 2.50 



