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The hectograph method was used by the Escape Committee in Stalag Luft III to print escape maps prior to the "Great Escape" of the night of March 24-25, 1944. Artists in the POW complement drew the maps initially in pencil, which were then redone as a series of masters used for the hectograph. The master maps were color-coded as per standard cartographic conventions (blue for watercourses, etc.), by using the crushed leads of indelible drawing pencils to ink the hectograph.
ReplyDeleteSource; "The Great Escape", by Paul Brickhill.
cheers
eon