368 Messrs. Dunstan and Dymond on an Apparatus 



elbow-bend to admit of its connexion with the reservoir H by 

 means of the stout rubber-tubing Gr. The diameter of tbe 

 bore of this glass tube is 3 milliin., and its length 1 metre, 

 measured from the point at which it joins the bulb to the 

 bend at the other end. To the summit of the bulb is sealed 





a piece of tubing which is bent round one side of the bulb 

 and terminates in the limb C, which acts as a Sprengel pump. 

 The length of the tube from the lower surface of the bulb to 

 the bend at its other end is about 1 metre, and the bore has a 

 diameter of 1*5 millim. The upper part of this limb, at a dis- 



