A Plan of the castle of Dunbarton [ie. Dumbarton] : and the repairs requisite to be done there 1709 /
O'Brien, John,active 1709.
cartographic

1709.
This sheet is divided into three panels. The smaller top and bottom panels contain the title, year and engineer's name, and the "Refference" and scale bar. The middle panel, which constitutes the main body of the sheet, contains a plan of Dumbarton Castle in 1709, and the proposed improvements, with details of the rock, the Firth of Clyde and the River Leven. There is a faint draft image in the upper left hand side of the castle plan, which may indicate older works. The upper right hand third of the sheet has numbered grid lines drawn in pencil behind the main drawing. The proposed new works shown are a house for the Governor and Deputy Governor, a wall along the waterside, "taking In a Parrade which is Mightily wanting in the Castle", a vault for the powder magazine, an additional storehouse, "a Passage Cutt through the Rock, to mount the Same with more Ease & under cover", and a gate "under Cover of the Rock", with "Barriers in front of the Gate."
In panel at top of sheet: title, year and "Jo: O'Brien", originally hand lettered in ink, but now with the left half of the original panel torn away, and its text hand lettered on to the backing sheet in similar calligraphy, in pencil.
In panel at bottom of sheet: written in ink "Refference", with list of code letters, and names of features on plan to which they refer, and 53.34 mm. scale bar, graded 0-5-0-10[0]-200 feet.
In top left hand corner of main panel: library shelfmark written in ink, and "B.O" with upwards arrow, stamped in red.
In bottom right hand corner: written in ink "B.4.F21".
In bottom left hand corner: "3" written in dark brown ink over something unreadable in lighter ink.
Has watermarks and is torn.
Tabraham Chris. Fortress Scotland and the Jacobites, 1995,
Board of Ordnance. Register of Plans 1700-1800,
Shows Dumbarton Castle, Dunbartonshire, with the Firth of Clyde and the River Leven.
Board of Ordnance Plans,
Dumbarton Castle (Dumbarton, Scotland)
Maps, Military