Catalogue description documents rel to the Portsmouth-to-Admiralty semaphore line designed by Popham

Details of MS/1937

Reference:	MS/1937
Description:	documents rel to the Portsmouth-to-Admiralty semaphore line designed by Popham
Date:	c1811
Held by:	Science Museum Library and Archives, not available at The National Archives
Other reference:	See Annual Return 2019

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