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Boosted by jsonstein@masto.deoan.org ("Jeff Sonstein"):
FourT4@mastodonapp.uk ("Jon Roach, ♻️ Duke of York") wrote:

First exhibit in the Royal Signals museum: a model of a 6-bit clacks.

The one at Blandford was part of an Admiralty chain between Plymouth and Whitehall, operating in the first half of the C19th and superseded by the electric telegraph. There was also a branch to Portsmouth.

#GNUTerryPratchett

A model.of a shutter tower..It comprises a single storey building topped by a rectangular wooden frame about 1.5x as high as the building. The frame is divided into a 3 high x 2 wide grid by slats, and each place in the grid has a shutter than rotates around its central horizontal axis to open and close.