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



471 



No. 12890. No. 12891. 



No. 12908. 



No. 12912. 



12885. 

 12886. 



12884. STOP-COCK, Brass, for gas, single, nickel-plated. Especially suited for laboratory use. The 

 nipple is 2% inches long, tapering from % inch diameter at the valve to *4 inch diameter at 

 the end. The serrations prevent rubber tubing from slipping off. With % inch iron pipe 



male thread ?0.60 



STOP-COCK, Brass, two-way, consisting of two No. 12884 Single Stop-Cocks, with flange. 2.50 

 STOP-COCK, Brass, four-way, consisting of four No. 12884 Single Stop-Cocks, with flange. 4.00 



STOP-COCKS AND NIPPLES FOR AIR PUMPS. 



The following nipples and stop-cocks are accurately made of brass, polished and lacquered, and in 

 order that they may be capable of the greatest service in the laboratory we have not threaded them for 

 use with iron pipe fittings, but have used the same threads as are used on all our Air Pump Plates and 

 Air Pump Accessories (v^g-inch i n diameter and 16 threads to the inch). Stop-cocks are ^ inch bore; 

 nipples, % 6 inch bore. 



12890. NIPPLE, of brass, female screw 



12891. NIPPLE, of brass, male screw 



STOP-COCK, double male screw 



STOP-COCK, one end for tubing, the other with male screw 



STOP-COCK, both ends for tubing 



STOP-COCK, one male and one female screw 



STOP-COCK, one end for tubing, the other with female screw 



STOP-COCK, both ends with female screws 



12892. 

 12893. 

 12894. 

 12895. 

 12896. 

 12897. 

 12900. 



.40 

 .40 

 .60 

 .60 

 .60 

 .80 

 .80 

 1.00 



STOPCOCK, Brass, for No. 6720 Gas Bags. One end for attaching rubber tubing, the other a 



%x2 1 /-inch brass tube for nozzle of gas bag .90 



12908. STOP-COCKS, Glass, straight. 



Bore, mm 1 2 3 4 5 



Each 1.25 1.38 1.75 2.00 2.25 



12910. STOP-COCKS, Glass, same as No. 12908, with curved outlet for aspirator bottles, etc. 



Bore, mm 1 2 3 4 5 



Each 1.50 1.65 2.00 2.25 2.50 



12912. STOP-COCKS, Glass, same as No. 12908, but with capillary tubes for use in gas analysis appara- 

 tus, etc. Outside diameter of tube, 6 to 7 mm. 



Bore of stopper, mm ; 1 3 



Each 1.40 1.50 



