Gellir lawrlwytho cynnwys at ddefnydd anfasnachol, megis defnydd personol neu ar gyfer adnoddau addysgol.
Ar gyfer defnydd masnachol cysyllwch yn uniongyrchol gyda deilydd yr hawlfraint os gwelwch yn dda.
Read more about the The Creative Archive Licence.

Disgrifiad

Notching timber at Baldwin's Level, Pontypool c.1900.
You are now standing inBig Pit's timber stockyard. Making sure the roof is well supportedhas always been a satey concern for miners. Before modern steel arches were used, pit props were cut from timber using the 'Welsh notching' method as seen in the picture.
Miners in the past described a distinctive creaking if wooden props began to move: early warning of a roof fall.

Oes gennych chi wybodaeth ychwanegol am yr eitem hon? Gadewch sylwad isod

Sylwadau (0)

Rhaid mewngofnodi i bostio sylw