.Hello: I did not look at this message closely the first time. I now note that one of the children was born in Furnace. I have always heard the older members of my family talk about the Bon Awe Furnace which I understood to be a slate quarry. In fact I can remember having the quarry pointed out to me, and it seemed to be a sort of surface mine up a substantial hill. My recollection is that it is beside Loch Etive and can be seen from across the Loch. Members of our family worked there for short periods in the 1920's and after. The slates were used for roofing. Margaret in Toronto