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BLUE PRINT

BLUE PRINT cover image
BLUE PRINT cover image BLUE PRINT cover image BLUE PRINT cover image
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by: Harry James
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Publication Date: February 25, 2019
Book Size: 8.5" x 8.5"
Pages: 223
Binding: Perfect Bound
$18.64

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Book Synopsis
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.
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