VOL.8. NO.2
1.ABORATORV ASPIRATOR PTJMP
SO9
AN INEXPENSIVE, EFFICIENT LABORATORY ASPIRATOR PUMP WALLACE H. Dnvmsolu, DAKOTA WESLEYAN UNIVERSITY, MITWLL,SOUTH DAKOTA
The aspirator pump has various practical applications in the chemistry laboratory. Among these might be mentioned its use for general filtration, distillation, vacuum, and pressure (1)purposes. The pump described herewith is made of the simplest laboratory equipment. The cost is almost negligible. It will be found to be most convenient around any general laboratory where the demands are not too exacting. However, this pump will produce a surprisingly high or low pressure when attached to the usual water supply. The apparatus consists of a piece of 5 / r i n ~ h pressure rubber tubing about 12 inches long and a piece of 6-mm. glass tubing about 2 inches long with a shoulder a t one end formed by heating and pressing the end of the tube against the base of a ring stand. The glass tube is introduced through a small hole in the side of the rubber tubing and secured firmly in place with adhesive tape or similar material. A piece of 3/s-inch rubber tubing connects the 6-mm. glass tube to a trap. The trap is then connected to a 4-02. bottle which contains a double-hole stopper, 60-degree funnel, and a 6-mm. right-angle glass bend. The pipe is connected a t its upper end to a faucet furnishing water from the city pipes. The faucet is greatly constricted a t the end and the air pressure is reduced far below atmospheric pressure. The vessel to be evacuated is, as stated above, connected to the pump by the side tube.
Literature Cited (1) HOWALL,"Apparatus for Supplying Air under Pressure," J. CBEM.EDUC.;7, 2674 (Nov.. 1930).
