374 A2323aratus for Rapid Gas-Analysis. 



The attachments to these tubes below are seen from the drawing, 

 except that the stop-cock / is three-way and has a delivery 

 through its stem. The bottles K and L hold about a pint each. 

 The tubes A and B are connected above with one another, and 

 also with the cylindrical funnel M, by a series of capillary tubes 

 about one millimeter in diameter inside. There is a stop-cock 

 at G and another at F, while the funnel M, which holds about 

 60 C.C., is ground to fit over the end of F above. At i^ is a 

 piece of rubber tubing uniting the ends of the capillary tubes, 

 which are filed square to make them fit as closely as possible.* 



In beginning the analysis of a mixture of gases, the stem exit 

 of the three-way cock 1 is closed by turning it so that L and A 

 are connected through the rubber tubing ; the stop-cocks 7^ and 

 G are opened, and water is allowed to fill the apparatus from 

 the bottles K and L, which have been previously supplied. 



When the water rises in the funnel M, and all air-bubbles 

 have been driven out of the tubes, the stop-cocks F and G are 

 closed, the funnel J/ removed, and the tube delivering the gas 

 attached in its place, f By now lowering the bottle L slowly, 

 and simultaneously opening the stop-cock F, the tube A is 

 nearly filled with gas, and the stop-cock i^is closed. The tube 

 delivering the gas is removed, the funnel 1/ replaced, the bottle 

 L raised, the bottle -fiTlowered, and by oi)ening the stop-cock G, 

 the gas is transferred to the graduated tube B. 



The bottle K \% now adjusted so that the level of the water in 

 it is the same hight as the zeio-mark I) on the graduated tube. 

 By means of the bottle L, the gas is adjusted to the zero-mark 

 D in the graduated tube, and the stop-cock G is closed. 



* The hight of the apparatus caa be dhniaishecl by having bulbs at tlie 

 points of union of the capillary tubes and the absorption and measuring- 

 tubes A and B ; such bulbs being of about 25 cubic centimetres capacity, 

 and the graduations continued downwards from the bulb on the tube B. 

 Making the funnel spherical also reduces the hight of the apparatus. 



f A tube of the same construction as is shown in the explosion -bui'ette 

 figure can be attached to the end of the stop-cock, and thus facilKate the 

 attachment of the rubber tubing. See H, Plate XXIII. 



