M. Cary Lea on a Constant Aspirator and Blower, 245 



pear to be rough prisms of from half an inch to an inch in diam- 

 eter. One of these gave an angle of 106° to 106° 80'. 



Since writing the above, I have discovered ambljgonite in 

 specimens of lepidolite from the tourmaline locality at Paris, 

 €ight miles from the Hebron locality. 

 Sheffield Laboratory, Yale CoUege, June 25, 1862. 



Various modes of producing a blast of air by means of 

 flow of water have been proposed for laboratory use. A so 

 what complicated system involving the use of two fluids, r 

 cury and water, was published in the Philosophical Maga: 



described in this Journal. 



It occurred to me that this principle might be made use of for 

 aspirating, as well as for driving, a current of air, and experiment 

 i«lly confirmed the idea. I have also modified the shape j 

 of the arrangement for catching the air described by Dr. 



intended for aspirating, and next the complete appara- 

 tus [or all purposes. 



-1- he aspirator is extremely simple. It is nothmg more 

 than a tin tube represented by fig. 1, about two feet long, 

 and four-tenths of an inch internal diameter, with a branch 

 three-tenths of an inch in diameter and 4 inclies long, 



ontally s 



X distance of four inches from the 



Berted hori 

 "Pper end. 



^or use, the tube is supported vertica 

 manner over a sink. An india-rubber 

 ti^he communicating with a water-faucet 

 IS passed over the end of the smaller hori- 

 zontal tube A. Another india-rubber tube 

 opening B with the appara- 



vhich I 



tus through 



^Q as th°e current of water is established, 

 r'^e air is aspirated. In the figure sub- 

 Joified, the air enters at D after being as- 

 pirated through the Wolfe's bottle, or 

 apparatus through which 



fi?red to pass a current" of air, enters the 

 t"i tube at B, and is drawn through with 

 ^iie water supplied by the pipe A and, 

 <^^Ping at C. The power of this ' 



