134 D. A. Kreider—Forms of Laboratory Apparatus. 
length than the hand is able to cover completely and may be 
closed with a glass stopper selected to fit tightly. Providing 
the space through the T-part is kept at a minimum compared 
with that of the compressing rubber, rapid pumping will be 
found possible and the power limited only by the strength of 
the user’s grip. A column of water was quickly raised and 
forced from the top of a tube sixteen feet in length. The 
apparatus will be found convenient in the absence of a regular 
pump and can be quickly constructed of materials always at 
hand. Originally it was made, in about fifteen minutes, of a 
T-tube to which the necessary enlargements were connected by 
rubber tubing and the unused space filled by a glass rod. The 
valves may be inserted directly into the ends of the compress- 
ing rubber, but the form shown in the figure will be found 
more serviceable. By attaching the lower end to a tapering 
tube as shown, the pump is easily inserted into any sized per- 
foration of a stopper and adds greatly to its convenience. 
The pump has been found serviceable in various applica- 
tions. For filling burettes it will be found more advantage- 
ous than the siphon plan. The standard solution bottles 
are fitted with two-holed stoppers from one of which a tube of 
sufficient length is bent so as to reach into the burette. The 
pump can be applied to various bottles by the adapter shown 
in the figure and the solutions forced into the burettes. To 
prevent any evaporation in the tube a glass stop-cock may be 
inserted. On several occasions it has been applied to a Kipp 
generator in which higher pressure was momentarily required. 
In various other ways it has been found a useful piece of 
apparatus. 
