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All books using the keywords: Harry James

BLUE PRINT Harry James
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$18.64
Size: 8.5" x 8.5"
Binding: Perfect Bound
A blueprint is a reproduction of a technical drawing using a contact print process on light-sensitive sheets. Introduced by Sir John Herschel in 1842, the process allowed rapid, and accurate, production of an unlimited number of copies. It was widely used for over a century for the reproduction of specification drawings used in construction and industry. The blueprint process was characterised by white lines on a blue background, a negative of the original. The process was not able to reproduce color or shades of grey.