A common form of urinal is shown in Fig. 13. The partitions and slab at the back are either of slate or marble and the bowl of porcelain. They may be flushed like a closet. Fig. 14 shows a section through the bowl and indicates the manner of flushing, partly through the rim and partly at the back. The trap or seal is shown at the bottom. Another form is shown in Fig. 15. In this case the bowl remains partly filled with water which forms a seal as shown. It is flushed both through the rim and the passage at the back. In action it is the same as the syphon closet shown in Fig. 8 and the bowl is drained each time it is flushed, but immediately fills with water to the level indicated.

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Fig. 13.

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Fig. 14.

An automatic flushing device is illustrated in Fig. 16. When the water line in the tank reaches a given level, the float lever releases a catch and flushes the urinal. The intervals of flushing can be regulated by adjusting the cock shown in the inlet pipe, near the bottom of the tank.

A simple form of urinal commonly used in schools and public buildings is shown in Fig. 17. This is flushed by means of small streams of water which are discharged through the perforated pipe near the top of the slab at the back and run down in a thin sheet to the gutter at the bottom.

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Fig. 15.