X/Dorothea/1215
1 file, including: notes on production at Slate Mills, 1925; tests on acid resistance of slates, 1934; correspondence and notes on water flow; list of complaints; notes on rainfall, 1923-1933; notes on proposal to form a syndicate to sublet Quarries; cross section plan of slate beds, 1900, and other geological notes; criticisms of aerial ropeways; new wages agreement, 1932; particulars of production, 1912; Directors’ reports, 1929-1933.