Page "Retriangulation of Great Britain" Paragraph 3

It was commenced in 1935 by the new Director General of the Ordnance Survey, Major-General Malcolm MacLeod.

The effort was directed by the cartographer and mathematician Martin Hotine, head of the Trigonometrical and Levelling Division, who planned the operation in a manner similar to a military campaign.

Every detail of the operation and measurements was carefully specified in advance to attempt to produce the most accurate measurements possible, given available technology.