▁or ▁force ▁vs . ▁speed ▁in ▁much ▁the ▁same ▁way ▁an ▁elect rical ▁transform er ▁adjust s ▁voltage ▁vs ▁current . ▁ ▁Fact ories ▁were ▁fitted ▁with ▁overhead ▁line ▁sh aft s ▁providing ▁rot ary ▁power . ▁Short ▁line - sh aft ▁systems ▁were ▁described ▁by ▁Agr icola , ▁connecting ▁a ▁water w heel ▁to ▁numerous ▁ore - processing ▁machines . ▁ ▁While ▁the ▁machines ▁described ▁by ▁Agr icola ▁used ▁ge ared ▁connections ▁from ▁the ▁sh aft s ▁to ▁the ▁mach in ery , ▁by ▁the ▁ 1 9 th ▁century , ▁drive bel ts ▁would ▁become ▁the ▁norm ▁for ▁linking ▁individual ▁machines ▁to ▁the ▁line ▁sh aft s . ▁One ▁mid ▁ 1 9 th ▁century ▁factory ▁had ▁ 1 , 9 4 8 ▁feet ▁of ▁line ▁sh aft ing ▁with ▁ 5 4 1 ▁pul le ys . ▁ ▁H yd ra ul ic ▁systems ▁use ▁liquid ▁under ▁pressure ▁to ▁transmit ▁power ; ▁can als ▁and ▁hydro elect ric ▁power ▁generation ▁facilities ▁har ness ▁natural ▁water ▁power ▁to ▁lift ▁ships ▁or ▁generate ▁electric ity . ▁P ump ing ▁water ▁or ▁pushing ▁mass ▁u ph ill ▁with ▁( wind mill ▁p umps ) ▁is ▁one ▁possible ▁means ▁of ▁energy ▁storage . ▁London ▁had ▁a ▁hyd ra ul ic ▁network ▁power ed ▁by ▁five ▁p ump ing ▁stations ▁operated ▁by ▁the ▁London ▁H yd ra ul ic ▁Power ▁Company , ▁with ▁a ▁total ▁effect ▁of ▁ 5 ▁M W . ▁ ▁P neum atic ▁systems ▁use ▁g ass es ▁under ▁pressure ▁to ▁transmit