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GB Patent: GB-178,001,244
Method of copying letters
Patentee:
James Watt - Birmingham, England

USPTO Classifications:

Tool Categories:

Assignees:
None

Manufacturer:
James Watt & Co. - Birmingham, England

Witnesses:
Unknown

Patent Dates:
Granted: Feb. 14, 1780

Patent Pictures:
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Wikipedia biography of James Watt
Description:
Before this invention, copying mechanical drawings required laborious line-by-line retracing of the original. Watt's innovation was to press a solvent-soaked sheet of thin paper over the original. Some ink was transferred to the second sheet which could then be viewed when held up to the light. Watt experimented to find the right combination of ink, paper and solvent plus a press and a method of wetting the thin paper. He partnered with Matthew Boulton (see the description for patent GB-913 and business manager James Keir, to create a business, James Watt & Co., to manufacture his copying system.

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