The control scheme is Ward Leonard with a simple amplidyne control initially arranged for manual operation but suitable for later adaptation to automatic control. ... size and weight limitations to enable them to be lowered down the shaft, where one will be used as a service hoist and the other as a main hoist. ... They are rated at 3, 390hp and 65-2rpm for the initial sinking duty and are force- ventflated.
|Title||:||Mining and Minerals Engineering|