ASPIRATOR

An apparatus for drawing a stream of air through a tube or other ve el. There are several forms of aspirator; that invented by Brunner is perhaps one of the most convenient. It consists of two equal cylindrical ve els placed one above the other, and communicating by tubes which can be opened or closed, so that when the water has run from the upper to the lower ve el, the apparatus turning for the purpose on a horizontal axis may be inverted so as to bring the empty ve el to the bottom and the full one to the top; the water may then again be made to flow without the trouble of refilling. See Air, Analysis of .