DRAINAGE. 



47 



back, as shown by the dotted Hnes. The ordinary size measures 

 8 inches square on the outside at the top, but they can be also 

 obtained in other sizes, and fitted either with iron gratings 

 or perforated earthenware covers. 



Plates ^$, 34, and 35, illustrate the covered drainage of Drainage of 

 omnibus and tramway stables, containing a large number of 



Fig. 27. 



Fig. 28. 



omnibus and 



tramway 



stables. 



horses in each building. The stable illustrated on Plate ^$ 

 contains twenty horses, and has an area of 1350 feet super. 

 It is trapped by two brick gullies (14 feet from each end wall) 

 built in 4^inch brickwork and also rendered inside with 

 cement ; they are 1 2 inches square, their depth being regulated 

 by their position on the line of pipes. The pot is of strong 

 cast iron, shown in Fig. 28. The loose boxes shown on Plate 37 

 are each drained in the centre by a similar gully, the paving 

 having a uniform fall of i in 50 from all sides. These boxes 

 are 10 feet by 10 feet, and have, therefore, an area to be 

 drained of 100 feet. 



The ultimate disposal of the sewage, after its passage through Disposal of 

 the pipes, depends upon whether it is taken to a cesspool, often sewage. 

 the case with stables in the country, or to a system of public 

 sewers. 



In the designs numbered i and 4, on Plates i and 7, it will Cesspools, 

 be seen that the drainage is taken to a central cesspool. It 

 will be necessary to describe the construction of the first of 

 these cesspools only, which acts in the double capacity of 

 cesspool and dung-pit, and is marked K on the plan. This 

 cesspool, designed to receive the drainage from the surrounding 

 buildings, is 6 feet in diameter and 9 feet deep, and contains 



