Just for some weekend fun….
Blueprints were introduced in the early 1840’s to make the replication of drawings somewhat easier. The process used a ferric compound which was impregnated into paper. The process was normally that the original drawing would be made on Cartridge Paper. This was a very heavy paper made especially for rifle cartridges in the days before brass replaced them.
The drawing would then be traced onto a tracing paper with black Indian Ink. This would be placed on top of the treated paper and sandwiched between glass plates. The plates would then be paced in the sun for around 2 minutes (allow 10 minutes for a cloudy day…) and the copier could see the exposed paper turn blue (Prussian blue). When the desired depth of tint had been achieved the copy would be removed and washed. The areas underneath the ink would have remained white, the washing process would remove any remaining ferric compound and preserve the drawing. This would make any changes difficult to conceal and thus the “blueprint” of any plan would form the basis of construction/manufacture and seal whatever contract had been struck.
In order to celebrate the completion of the basic design, we have created a “Blueprint” of the Heritage Flight Simulator in AO size. Printed, this will create a most attractive poster. It’s a fairly large file of 16Mb. Feel welcome to head over to our shop and purchase it…for free!