﻿Nov., 1858.] 



ELLIOTT SOCIETY. 



293 



Two uprights secured to a convenient stand, sustain the pivots 

 and permit rotation. At the upper part of each upright is 

 attached a shelf to support the Y tubes, which are firmly fixed, so 

 that the stem of the Y is in the prolongation of the axis of the 

 cylindrical pivots, and the branches of the Y in a horizontal plane. 

 To avoid confusion, the mode of attaching the Y tube is not 

 represented in the wood cut. The Aspirator being rotated about 

 its pivots until it lies horizontally with the partition in a vertical 

 plane, the ends of the two projecting portions of each pair of 

 lead tubes will be found in a horizontal plane opposite the cor- 

 responding branches of the adjacent Y tube, and the India- 

 rubber connectors are attached in this position. When the 

 Aspirator is brought into a vertical position with either base 

 uppermost, these flexible connectors will be slightly crossed, 

 but free passage through them in no degree impaired. If the 

 other base is to be brought uppermost, the Aspirator must be 

 rotated back to the original horizontal position, and then that 

 base brought uppermost, in order to avoid entwining the flexible 

 tubes. An aperture, in the center of each base, permits eithe 1 

 compartment to be filled with water, the aperture being closed 

 air-tight by a cork. 



Now, suppose the Aspirator to be brought into a vertical posi- 

 tion with the compartment containing water uppermost, the lower 

 flexible tube of ingress, (on right side of figure,) and the upper 

 one of egress, (on left side,) each closed by a- compressor ; then 

 will the water in the upper compartment flow into the lower, 

 through the aperture in the partition, escape of water by the 

 upper tube of egress being prevented by the compressor, and 

 through the upper tube of ingress by its curved form; air 

 will enter by this tube of ingress into the upper compartment, 

 to supply^the place of the water, and air will issue from the lower 

 compartment by the lower tube of egress, being prevented from 

 escaping through the lower tube of ingress by the compressor. 

 If, now, any chemical apparatus be connected with the main tube 

 of ingress, a current may be established through the apparatus by 

 aspiration, until all the water flow from the upper to the lower 

 compartment, and then by shifting each compressor to the adjacent 

 flexible tube, and inverting the Aspirator, the current will be 

 established again in the same direction, and may thus be made 

 nearly continuous, but a few seconds being occupied in each 

 inversion of the Aspirator. The velocity of the flow of the water 



