246 M. Carey Lea on a Constant Aspirator and Blower. 



one no larger than here described, a column of water of fifteen 

 inches was easily displaced. The end C may be inserted into 

 the funnel of a Liebig's condenser, and the water employed for 

 cooling may be made at the same time to keep the aspirator m 



The aspirating tube (which may also at need replace the blow- 

 ing tube subsequently to be described) may be 



aal diameter. 



I alcohol. 



s convenient plan to construct an appa- 

 capuble of combining both the functions of blowing and 

 aspirating. Such an arrangement is exceedingly useful, and can 

 be made with very little trouble. For this purpose, a tin pipe, 

 AB, about three feet in length and half an inch internal diame- 

 ter, has two smaller pipes 4 to 6 inches long soldered into it. 

 These are three-tenths of an inch in ii ' '' ^'" 



CD, is inserted at right angles, about 

 four inches from the end ; the other is 

 inserted about an inch lower, and makes 

 an angle of about 45°. The lower end 

 of the tube passes through the cork of 

 a tolerably wide-mouthed gallon bottle 

 extending rather more than half way 

 down. The tubes may be made of 

 smaller calibre and shorter, even 18 

 inches answers very well, but the sizes 

 given are those which I have found to 

 afford the best results. The tin pipes 

 can be made by any tinsmith in a few 



Two glass tubes also pass through 

 the corkf of the bottle, a short small 

 tube, G, over the outer end of which 

 an india-rubber tube is passed, and a 

 large tube, H, about half an inch in 

 bore, extending to the bottom of the 

 bottle. Its outer end bends over and 

 IS connected by six inches of india- Ij 





r glass) h 



