today I nipped back up to abercwmeiddaw and took some more photos. The scoring made by the unit entering and exiting the bore
🔗Abercwmeiddaw-Slate-Mine-User-Album-Image-026[linkphoto]Abercwmeiddaw-Slate-Mine-User-Album-Image-026[/linkphoto][/link]

and the pitch of the groves.
🔗Abercwmeiddaw-Slate-Mine-User-Album-Image-028[linkphoto]Abercwmeiddaw-Slate-Mine-User-Album-Image-028[/linkphoto][/link]
the end of the long bore has been worked by han by drilling.
🔗Abercwmeiddaw-Slate-Mine-User-Album-Image-029[linkphoto]Abercwmeiddaw-Slate-Mine-User-Album-Image-029[/linkphoto][/link]

the single bore is only about 10 feet long and we did not quite make it in.
Thorpey

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You're a gem, Thorpey, thank you very much indeed for the pictures.
I'm still here on this subject, it's just that I went back to review all I've got on the matter (mostly thanks to Grahami :thumbsup: ) and also do some research on Wolfram/Tungsten as well as reading up on the Roebling family (wire rope).. etc!
:thumbsup:

Hey guys
The Hunter Tunneller was used in the late 1860's to bore the Rhos Goch Adit to drain the lower part of Cwm Machno Quarry.
https://www.google.com/maps/place/53%C2%B000 '28.4%22N+3%C2%B051'30.6%22W/@53.007899,-3.8595883,326m/data=!3m2!1e3!4b1!4m14!1m7!3m6!1s0x48651313e0ed3aed:0xd7141857547e1daa!2sCwm+Penmachno,+Betws-y-Coed+LL24+0RP!3b1!8m2!3d53.010257!4d-3.856949!3m5!1s0x0:0x0!7e2!8m2!3d53.0078989!4d-3.8584941

That links to an email address?

Weird! Take the 'mailto:' off
https://www.google.com/maps/place/53%C2%B000 '28.4%22N+3%C2%B051'30.6%22W/@53.0078889,-3.8595688,334m/data=!3m2!1e3!4b1!4m14!1m7!3m6!1s0x48651313e0ed3aed:0xd7141857547e1daa!2sCwm+Penmachno,+Betws-y-Coed+LL24+0RP!3b1!8m2!3d53.010257!4d-3.856949!3m5!1s0x0:0x0!7e2!8m2!3d53.0078989!4d-3.8584941

The general consensus seems to be that the Rhos Goch tunnel was driven (at least in part) by one of Hunter's tunnellers - probably the first version - based on the groove marks in the bore, but no-one has as yet come up with any connection between the quarry and either George Hunter or W.F.Cooke who were involved at Maenofferen. It would have been an interesting exercise to get the machine from Maenofferen over to Cwm PenMachno and, presumably back again. The bored length is about 46.5 ft long and given the usual rate of boring of such a machine of 5-8 inches per hour would have taken a considerable time especially as the machine would have had to have been withdrawn from the tunnel regularly to enable the "core" to be extracted (the maximum cutting depth was approximately 2ft - up to 3 hours work)!

It has been suggested that Rhos Goch may have been the site of a trial by Brunton's boring machine, but this is tenuous with even less evidence.

Grahami

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It is an odd one...
goes from this

🔗12778[linkphoto]12778[/linkphoto][/link]
thru this
🔗12786[linkphoto]12786[/linkphoto][/link]
bored section
🔗12779[linkphoto]12779[/linkphoto][/link]
to this in natural rock at the end (now filled in)
🔗12783[linkphoto]12783[/linkphoto][/link]

Its a little bit moist at the first part as well...

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Thanks Graham
Interesting

No problem - if you havn't seen it there's my paper on the various Hunter machines,including the several tunnellers available on here:

www.aditnow.co.uk/documents/Personal-Album-54/The-Hunter-Machines-inc-Illus.pdf

As well as the discussion linked to earlier.

Grahami

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