Baseline building, Lough Foyle unknown
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Baseline building, Lough Foyle
Sectional elevation of the proposed building intended to protect the baseline used in triangulation measurements for the Ordnance Survey of Ireland, supervised by Thomas Colby. The section shows the removable capstone, intended to allow access to the baseline. An accompanying letter by Thomas Colby, Ordnance Map Office, Tower of London, to Davies Gilbert notes that: 'In the enclosed sketch and section, the buildings are of such a diameter as to clear the foundations of the blocks and of such an altitude that the view from our instrument placed upon them would not be obstructed by ordinary fences. The centre of the roof is formed of a stone having a hole in it to admit a smaller stone placed accurately over the point; which latter may be taken out without disturbing the building, and a boy may go down to clean the point …'
- Image reference: RS-12975
- The Royal Society
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