I assume this means mill as its a derelict watermill on Muileann Eitag Bagh (bay?) on Loch Caolisport.

Part of a series of 6. The mill is most unusual having both an inner and outer wheel position and in the 'window' sockets for a vertically axled gear wheel.

Please look at the other pics if interested in mills and any info on this type of drive would be welcome.