HYDRO ELECTRIC INSTALLATIONS, LIII. 
Horse | nistance of Sizeof |Height|o 2°9 |of each 
Table I. Hower Trans- Voltage. | Transmiss- |jof rr ao alter- 
‘mitted: mission. ion Wire. |in feet. 3 2 E te 
North Wales | 10000] Several | 10000) Several |1140/ 500 | 1500 
Great Britain totalling circuits of 
about 100 No. 2 
miles S.W.G. 
Launceston, 1300] 5 miles | 5000 {2 circuits| 112 |500| 300 
Tasmania. 19/14 
Waipori, 3300 |12 and 15) 2400 |2 circuits) 670 | 430 | 1000 
Dunedin, miles to. |Nos. 2, 3, 
N. Zealand. 35000 |B. & S.G. 
Hillgrove, 250/194 miles| 550 | 1 circuit | 300] 750) 160 
N.S. Wales. to 7/18 
23000 
Nots.—The system of transmission in each case is three phase, 
the periodicity 50 cycles per second, and the transmission wires 
of copper. 
Schedule of particulars of Snowdon Transmission of North Wales, 
of which a series of slides was exhibited. 
Water taken from Lake Lidaw, on east side of Snowdon, 120 
acres in extent, at 30 feet below surface, through two steel pipes 
1} miles long. 
Each pipe 30 inches diameter by 3%; inch thick, rivetted, at 
upper level and increasing in thickness to ? inch thick and 27 in. 
diameter welded, at power house 1,140 feet below. 
Pipes in 18 feet lengths, carried on 10 x 7 inch wood sleepers 
10 feet long, spaced 8 feet apart. On steep slopes each pipe length 
anchored to concrete block, 8 feet x 3 feet x 44 feet. 
Catchment area limited by the Snowdon ridge, but rainfall aver- 
ages over 190 inches per annum, the heaviest being in August. 
Snow lying on the catchment helps to average up the supply of 
water in spring. 
