jagman
  • jagman
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17 years ago
Evidently it worked because the holes exist, but how was the waste removed?

Photograph:

🔗Maenofferen-Slate-Mine-Archive-Album-Image-031[linkphoto]Maenofferen-Slate-Mine-Archive-Album-Image-031[/linkphoto][/link]
sparty_lea
17 years ago
Fascinating.
The Beaumont's were experimenting with a machine of similar principle in the 1860s. They were trialing it in Thorngreen Quarry near Spartylea to bore a shaft. In that case they had to withdraw the machine, break up the core with black powder and muckout. I dont see how this one would be any different in that respect.
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Those that understand binary and those that do not!
grahami
17 years ago
Yes - that is the basic problem with any trepanning type tunneller - breaking up and removing the core. Hunter & Cooke 's later patent tunneller had a rotating drum which cut its way through the rock and did not leave a core. I forget whether the idea was to use the trepanner first and then the drum to remove the core, I'll have to re-read the patent. As far as I know there are no tunnels extant in which it was used. It is curious that a Brunton was the Engineer to MaenOfferen after the Hunter & Cooke trials. Brunton also patented a trepanning tunneller. (Not quite sure it's the same one...)

Graham
The map is the territory - especially in chain scale.
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