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Harper's Encyclopedia of United States History (ed. Benson Lossing) 2 2 Browse Search
Strabo, Geography (ed. H.C. Hamilton, Esq., W. Falconer, M.A.) 1 1 Browse Search
Knight's Mechanical Encyclopedia (ed. Knight) 1 1 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), P. (search)
pencils, and the amount taken from the mines yearly was strictly limited in order to keep up the price. The annual product was valued at £ 40,000. This source of supply eventually failed, but the loss was scarcely felt, as a number of other mines had been discovered in various parts of the world. The ancients drew lines and letters with leaden styles, and afterward an alloy of lead an tin was used. Pliny refers to the use of lead for ruling lines on papyrus. La Moine cites a document of 1387 ruled with graphite. Slips of graphite in wooden sticks (pencils) are mentioned by Gesner, Zurich, in 1565; he credits England with the production. They were doubtless the product of the Borrowdale mine, then lately discovered. In the early part of the seventeenth century, black-lead pencils are distinctly described by several writers. They are noticed by Ambrosinus, 1648; spoken of by Pettus, in 1683, as inclosed in fir or cedar. Red and black chalk pencils were used in Germany in 145