It's an example of Amos & Francis Patent Dresser. Patent No. 1884 of 1861. There used to be a few of these set up at the Dinorwic Quarry Museum. The photos below were taken in about 1974.
đź”—Personal-Album-54-Image-056[linkphoto]Personal-Album-54-Image-056[/linkphoto][/link]
đź”—Personal-Album-54-Image-057[linkphoto]Personal-Album-54-Image-057[/linkphoto][/link]
đź”—Personal-Album-54-Image-058[linkphoto]Personal-Album-54-Image-058[/linkphoto][/link]
đź”—Personal-Album-54-Image-059[linkphoto]Personal-Album-54-Image-059[/linkphoto][/link]
Cheers
Grahami
[tweak]image linked fixed[/tweak]
The map is the territory - especially in chain scale.