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



289 



No. 6944. No. 6946. No. 6948. 



6936. GAS MACHINES, Matthews, for the automatic production of gas for laboratory use, where a 

 source of natural or illuminating gas is not available. The machine consists essentially of 

 a carburetor to contain the gasoline and supply the gas, an air pump or blower to furnish the 

 air, an automatic mixer for producing the proper mixture, a weight which furnishes the 

 motive power for the air pump, and the necessary connections. The entire process is auto- 

 matic, it being necessary only to wind the weight up once a day, and to fill the carburetor 

 once or twice a year with gasoline. There is no danger in connection with this machine and 

 no extra insurance required as it has been passed by the National Board of Underwriters. 

 Complete as described with air pump, carburetor, mixer, pulleys, wire rope, weight holder 

 and all necessary connections, but not including gas pipe. 



No A B C D E F G H 



Number of burners 30 40 50 75 100 150 200 300 



Capacity of carburetor, gals. 156 202% 252 315 375 437 512 770 



Number of cells 22334444 



Shipping weight, complete, 



including mixer, Ibs 1150 1475 1600 2125 2525 2750 3000 3900 



Each $243.00 290.00 326.00 374.00 458.00 556.00 653.00 845.0C 



6944. GAS MEASURING TUBES, of glass, graduated, without stopcock. No... ABC 



Capacity, cc 25 50 100 



Graduated in, cc Mo Vio % 



Each 1.00 1.25 1.50 



6946. GAS MEASUEING TUBES, same as No. 6944, but with glass stop-cock. 



No A B C 



Capacity, ec 25 50 100 



Graduated in, cc Mo Mo % 



Each 2.40 2.90 3.25 



6948. GAS MEASURING TUBE, Kahlenberg's, with stop-cock and funnel top; graduated to 50 cc in 



Mo cc divisions , 3.00 



6786. GAS METEE, Wet Test Type, with dial graduated to Mo cubic foot in Mooo tns - Recording train 

 will integrate 100 cubic feet before repeating. Provided with two spirit levels, leveling 

 screws, filling funnel, outlet stop-cock, drain plug, gage glass, manometer, thermometer, and 



electric switch. Specially adapted for calorimeter work 65.00 



6956. GAS METEE, for Photometric Work, with Math cubic foot drum, and hourly rate dial reading 

 from to 5 cubic feet per hour. At the legal rate for candle power determination, 5 cubic 

 feet per hour, the large pointer makes one revolution per minute. Maximum capacity per 

 hour with ^ inch differential pressure, 18 cubic feet. Complete with water gage, ther- 

 mometer, two spirit levels and leveling screws; finished in dead black 75.00 



