Domestic sanitary engineering and plumbing: dealing with domestic water supplies, pump & hydraulic ram work, hydraulics, sanitary work, heating by low pressure, hot water, & external plumbing work

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...cocks, and which require a quick feed just prior to their discharge. (£) Those with mechanical parts, such as tippers, floats, valves, etc. Automatic flushing tanks are constructed of galvanised iron, and of concrete or brickwork; the former are suitable for fixing inside buildings, whilst the latter are suitable when they require to be placed below ground level. Fig. 155 gives Eodger Field's automatic flushing tank, which is representative of type a. At the top of the stand-pipe P a short taper pipe C, which forms an inverted frustum of a cone, is attached; the outer covering or dome D contains an air-hole H, and a trap T is formed with a small seal by submerging the end of the stand-pipe. The action of the siphon is as follows: When the water in the tank is above the air-hole H, air is confined in the upper part of the dome and standpipe; as the filling of the tank proceeds, the confined air is further compressed, until it overcomes the resistance offered by the water seal of the trap, when small volumes of air escape. Each time an escape of air takes place, the water rises higher in the annular space between the dome and the stand-pipe, until it finally reaches the top of the latter and overflows; the water upon falling through the stand-pipe gradually dis 155.--Field-s automatio flushing tank. places some of its confined air, and after a time the air pressure in P is so reduced that it is no longer capable of resisting that of the external air, when the discharge is started and the water siphoned from the tank. The purpose of the inverted frustrum C is to make the water fall clear of the sides of the pipe, for if it merely trickled down the sides no displacement of air would be effected, and the siphon would not be brought into action. The air-hole...