18 



EXTERNAL TANK, 



There is in the centre of the Prodt 

 Court Yard, 50 ft. from the Principal 

 Entrance Gates facing Great Rnssell 

 Street, an underground tank, about 18 

 inches below the level of the ground, 

 which is kept full. The water is 

 always on, and the supply is regulated 

 by means of a Lever Cock, the lifting 

 of which will cause sufficient water to 

 run in to keep the tank constantly 

 full, even when several Engines are 

 pumping from it together. 



EXTERNAL IRON MAIN. 



An Iron Main of nine inches 

 internal diameter lies round the out- 

 side of the Main Building, and also 

 round the outside of the interior 

 Quadrangle. It is about 3 ft. under 

 the surface of the ground, and is 

 kept always full of water by the New 

 River Company. This main has 

 connected with it one command cock, 

 one supply cock to roof, one safety valve, 

 seven divisional cocks, and 3o Fire 

 Cocks, numbered consecutively from 95 

 to 140 both inclusive. It has also a 

 pressure gauge, which is placed under 

 the arch at the South End of the 

 East Wing. 



There is on the roof an Iron Main 

 of three inches internal diameter, ex- 

 tending along the whole length of the 

 four sides of the Quadrangle, round 



