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The Webb Adder
1869 article in the
Scientific American
on the Webb adder
1870 article in the
Journal of the Franklin Institute
on the Webb adder
Image of Webb adder advertisement in
Harper's Weekly
, 1869
1891 ad for the Webb adder in the
Scientific American
Nov 5, 1889 U.S. Patent for the Webb adder
Detailed patent illustrations in pdf format
Nov 12, 1889 U.S. Patent for the Webb adder
Detailed patent illustrations in pdf format
Mar 10, 1868 U.S. Patent for the Webb adder (first form)
Detailed patent illustrations in pdf format
American Artifacts home page
a Webb adder for sale
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Contact:
Richard Van Vleck
