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Cyrn y Brain

Cyrn y Brain

Surveyor: Giles, John C.

Medium: Pen and ink on paper

Date: 1835

Shelfmark: OSD 340G

Item number: 26

Genre: Map

Map scale ratio: 2'' : Mile (1 : 31680)

The county boundary of Denbighshire and Flintshire is indicated here by a red pecked line. The plan is formally titled, with a note in the top left corner explaining that it has been copied from the original protraction with north facing upwards instead of true. A triangulation diagram appears on the reverse of the drawing: this enabled the draughtsman to plot with prominent topographical features with precision. Many pencil lines radiate from a trigonometrical point at Cefny Fedw, indicated by a dot within a triangle. These represent the angular measurements taken from this point.

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