Phil, if you look carefully at the photo of Dave Williams, he is wearing defenders. You can just see the orange pivots on his helmet through the condensation that the slusher has chucked out.
I'm finding all this fascinating, but that was my main thought in all this - what happens if it goes wrong? As in, the scraper just gets totally jammed? Presumably there's only so much load the pulley anchors can take? The winch guy seems awfully vulnerable in that situation. Also the noise operating these things in an enclosed space must be close to unbearable? I'm not seeing many ear-defenders, but is that as they were already deaf? I know Mark can still hear though, so maybe not
As I recall, you had to keep a lot of pressure on the lever to get the rope to move, if the bucket got stuck it just stopped, you couldn't apply enough pressure to keep the drum turning & break the rope, (each drum had a sort of band brake/clutch thing) which you had to pull really hard to make things move
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