It consists essentially of a tin tube (to which is fixed a branch tube open to the air), through which water may be driven from a supply tap into a properly fitted bottle. Air becomes thus entangled with the water in its course through the tube, and carried with it into the bottle. The water is then got rid of by means of a syphon, and the air is conducted by an elastic tube to the blow-pipe.
A, B, Tin tube, eighteen inches long, half-inch diameter. C, D, Tin tube, three inches long, one third-inch diameter, inserted at right angles. E, F, Tin tube, long enough to reach the level of A, one third-inch diameter, inserted at an angle of 45°. G, H, I, Siphon, half-inch diameter. K, L, Air tube, one third-inch diameter. M, India-rubber tube to convey away the air.
To set the apparatus in action, connect the tube
C D
with a water tap by means of a piece of elastic tubing, and turn on the water; pinch the tube
M
for a few moments between the thumb and finger until the syphon has begun to act. A blast of air will at once be felt at the extremity of
M
.