TTNXELS THROUGH MAUD ROCK 



The quantity of water capable of being taken from the 

 Diveria in winter, when the rivers which are dependent upon 

 the mountain snows for their supply are at their lowest, is 

 calculated to be 352 gallons per second. Thus, taking the 

 fall to be diminished by friction, etc., to 440 ft., and the use- 

 ful effect at 70 %, there is obtained 2,000 H.P. on the turbine 

 shaft. 



The metallic conduit varies in material according to the 

 pressure; thus cast-iron pipes 3 ft. in diameter and {$ in. 

 thick are used up to a pressure of 2 atmospheres, from which 

 point they are of wrought-iron. The cast-iron portion has of 

 late caused a <n>>d deal of trouble, owing to settlement of the 

 piers causing occasional bursts, consequently a masonry pier 

 has been placed under each joint of this portion. The follow- 

 ing table gives the thicknesses and diameters, varying with the 

 pressure : 



This pipe is supported every 30 ft. on small masonry piers, 

 on the top of which is placed a block of wood hollowed out to 

 receive the pipe, thus allowing any movement due to the con- 

 traction and expansion of the conduit However, to prevent 

 this movement becoming excessive, the pipe is passed at 

 intervals of 300 yds. to 500 yds. through a cubical block of 

 masonry of 13 ft side, strengthened by longitudinal tie-lwirn. 

 Five bands of angle-bar riveted round the pipe, with their 



