In this pic the cuts are all made by mechanised saw. The saw was a circular saw, possibly purpose-built for the owners Robinson and ? There is one surviving photo of the saw both on display at the interpretation board at the Weston Quarryman's Cottage and inside in the booklet on display.
The saw was steam powered and in order to get the torque needed to drive it through the stone (the cutting depth appears to be just over 400mm) it was driven by a pinion acting on a circular rack gear which was in the perimeter of the saw- just under the teeth and within the thickness of the blade. Quite a neat bit of casting and machining (it surely was cast?)
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Photo taken in Weston, Oamaru, New Zealand
Misplaced? Suggest new location