The Scientific American reference book; a compendium of useful information, containing the complete census of the United States by counties ... patent and copyright laws ... forms for patents, caveats, assignments, and licenses ... etc (1892)
New York, Munn · leaf 104
ts the paper. Provide a bit,of thin sheet lead, same size asthe zinc, bent in and nicked, butnot covered with paper. At-tach one end of a copper wire, as shown at 3. Providea common tea saucer, in which place one ounce of sul-phate of copper (to be had for a few cents at any drugstore); pour on… … l-^^ <<^
Patents
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
