This blogspot sets out to record photographically and by location, a range of the surveyor's Bench Marks which can still be found around the Island of Ireland. During the 19th century a very extensive and detailed mapping of the whole of Ireland took place. This work was undertaken by a team from the British Ordnance Survey Office. The first part of this work took place between 1827 and 1842 when Ireland was surveyed and maps of the country produced (1906 map sheets in all) at a scale of 6 inches to the mile. During the 1850s and 1860s revision work was carried to bring the maps up-to date and correct some errors. In 1888 new survey work commenced which mapped Ireland at a much more detailed scale ie 25 inches to the mile. The maps produced were considered to be of a very high quality and unequalled for any other part of the world at that time. At the present time copies of these maps are still available but technology has moved on and current mapping use...