278 



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



No. 6612. 



6606. GAS ANALYSIS APPARATUS, Burrell'S, for determining benzene or gasoline vapor in gas 

 mixtures by the freezing method. (See Journal of Industrial and Engineering Chemistry, 

 Vol. VII, No. 2, for February 1915, page 112; and Technical Paper 87, of the United States 

 Bureau of Mines, page 3) $10.00 



6612. GAS ANALYSIS APPARATUS, Dwights' CO 2 Indicator (Patent Applied for), for determining 



the percentage of carbon dioxide in flue gas and other mixtures. The outfit consists of a cast 

 metal tank with reservoir in the base holding enough solution for 300 tests. The tank is pro- 

 vided with special inlet valve with stop-cock, and an aneroid gage reading directly in percent- 

 age of CO 2 , in % per cent, divisions. The test is practically instantaneous, requiring only 

 1 minute to complete. Complete as described with 6 feet of rubber tubing and pressure bulb 

 i 25.00 



6613. TRAVELING CASE for No. 6612, covered with karatol grain leather, plush lined, with handle 



and nickel-plated trimmings, and with lock and key 3.00 



6614. GAS ANALYSIS APPARATUS, Dwights' CO 2 Indicator (Patent Applied for), same as No. 



6612, but with mercury gage mounted on the door of the carrying case, for obtaining the per- 

 centage of COo. The gage is specially designed to prevent spilling of mercury and is pro- 

 vided with an adjustable scale enabling the mercury level to be brought to zero when beginning 

 a test. Complete as described with 6 feet of rubber tubing and pressure bulb, leather covered 

 carrying case, plush lined, with handle, nickel-plated trimmings, and with lock and key. 28.00 



