Origin of black lead
Examples from the Web for black lead
To a chemist diamond and black-lead have the same composition, being indeed the same substance.The Story of a Tinder-box|Charles Meymott Tidy
Mark the case, with a black-lead pencil, at every half-inch; suspend it in the lathe; and cut it at the marks.The Pyrotechnist's Treasury|Thomas Kentish
A piece of transparent paper is then laid over the design to be copied, and traced in outline with a black-lead pencil.Popular Technology; Volume 2|Edward Hazen
Owing to its position near the black-lead mines, this was one of the earliest Lake mountains of which we have a recorded ascent.Climbing in The British Isles. Vol. 1 - England|W. P. Haskett Smith
The article to be copied is first covered with black-lead, and then a mould is made of it in wax or gutta-percha.