Heliograph Mk V annotated diagram
From RCSigs.ca
Description
An annotated diagram of a Mance style 5-inch Heliograph Mark V used by Canadian and other forces. The diagram is taken from Signal Training, Volume III, Pamphlet No. 2, Heliograph, 5-inch, Mark V issued by His Majesty's Stationery Office in 1922.
Original scanned photo found at Signal Mirror's Flickr page
File usage
The following page links to this file:
