A Treatise on Slate and Slate Quarrying: Scientific, Practical, and CommercialC. Lockwood and Company, 1880 - 186 стор. |
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Arenig Average Bala bands bargains Bettws Garmon blocks blue slates Cambrian Carnarvonshire chambers CHAPTER Cilgwyn clay colour Corris cost cross described Devonian Dinorwig Duffwys dykes failures feet felspar Festiniog Festiniog district fossils gallery Geological Goch green slates greenstone Grit Band grits hard rock hardened inches iron large quarry lease Limestone Lingula flags Llanberis Llandeilo Llangollen Llangynog LOWER CAMBRIAN STRATA Magnesia magnetic currents marls mass material matter Merionethshire mineral Moelwyn Nantlle North Wales Old Vein open quarry ordinary original overlying Penrhyn Penrhyn quarries planes porphyritic porphyritic rock portion Portmadoc poundage present produce profit Protoxide Purple Slates pyrites railway Rhiwbach Rhiwbryfdir roofing slates royalty seen shaft Shales side Silica slabs slate beds slate deposit slate quarries slate range slate rock slaty cleavage south-west split strata thickness thin thousand of 1,200 Tons Cwts tramway tunnel underground Upper weight Welsh slate Wenlock yards
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