"Between the wars" would be correct for these. They would have been in place prior to 1934 when the hydro was put in place. After that, they ran 2 dredges at the same time on the hydro system, which was run at 800kW with a 1.1mW capability. I'll put in a shot of the generator in the hydro power house, which was used until late in 1989 I think. Pics show the genset, flywheel, and the Pelton wheel housing. The Pelton is fed through a 5ft? diameter wooden pipe with 70ft of fall. Pipe made of incredible clear fir I think, or cedar. I'll add a pic of that and the penstock
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