Nautical descriptions of the west coast of Great Britain : From Bristol Channel to Cape-Wrath (the most North-Western promontory of Scotland); adapted to the several charts in the maritim survey of the west of Great Britain. Containing a particular account of the tides, rocks, shoals, channels, anchoring-places, and harbours, along that coast, with suitable sailing-directions interspersed. To which is prefixed The principal observations and measurements, on which the survey was grounded. By Murdoch Mackenzie, Sen.