Disc

From TrigpointingUK
Jump to: navigation, search

Disc

On man-made structures, such as church roofs, it was sometimes inappropriate to install a rivet into the existing fabric of the building. In such cases, an asphalt disc was poured onto the surface and the rivet installed in that. [1] [1] There are currently no photographs of discs available on TrigpointingUK.

  1. The History of the Retriangulation of Great Britain 1935-1962, p225, {{{2}}}