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Llandrillo

Llandrillo

Surveyor: Collard, Thomas W.

Medium: Pen and ink on paper

Date: 1831

Shelfmark: OSD 331

Item number: 13

Length: 36

Width: 31

Genre: Map

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

This original protraction is formally titled. The traverse routes are noted with the relevant dates and Ordnance Survey field-book page numbers. The conventional sign of a dot within a triangle indicates a trigonometrical point. These appear around the edges of the drawing in red ink, marking the points from which the surveyor took angular measurements to plot features of the landscape.

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