1. The siphon is made
of glass tubes, the longer pieces being bent on one end as shown.
The air receiver and regulating device are attached to the top end
of the lower tube, as shown in Fig. 2. The receiver or air inlet
is the most important part. It is made of a glass tube, 3/4 in. in
diameter and 5 in. long. A hole is filed or blown through one side
of the glass for the admission of air. The ends of the smaller
glass
[Illustration: FIG.1 FIG.2 Forcing Air Through Water]
tubes are passed through corks having a diameter to fit the ends
of this larger tube. The ends of these tubes should be so adjusted
that the continuous drops of water from the upper will fall into
the tube below. The succession of air bubbles thus imprisoned are
driven down the tube and into the tank below.
The regulator is placed in the tube or siphon above the air
receiver. Its purpose is to retard the flow of water from the
siphon above and make it drop rapidly. It consists of a rubber
connecting tube with two flat pieces of wood clamped over the
center and adjusted with screws. The apparatus is started by
clamping the rubber tube tightly and then exhausting the air in
the siphon tube, then placing the end in the upper reservoir and
releasing the clamp until the water begins to drop.
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