Plan of the gun-ports of Blackness Castle.
cartographic

[17--?]
In top left hand corner: title handwritten in ink in cartouche drawn as slab of stone, resting against cannon, with a pile of shot.
Below title: written in ink, "References and Explanation to the Plan" with list of code letters, and names of features on plan to which they refer, and below, "B.O" with upwards arrow, stamped in red.
In top right hand corner: library shelfmark written in ink.
In bottom right hand corner: library shelfmark written in pencil.
At bottom of sheet: scale bar graded [10]-[0]-10-20-150 feet.
Shows Blackness Castle, Scotland.
Board of Ordnance Plans,
Maps, Military