plumbago

• In a speaking-telegraph transmitter, the combination of a metallic diaphragm and disk of plumbago or equivalent material, the contiguous faces of said disk and diaphragm being in contact, substantially as described 2. —  Edison, His Life and Inventions
• You coat the copy with plumbago, as we forgers (sorry, we honest copyists) still call black lead, then sink it in a bath of electrolyte. —  Paid and Loving Eyes - Lovejoy - Jonathan Gash
• Both the surface of the type and of the wax are thoroughly coated with plumbago or black lead, which serves as a lubricant to prevent the wax from adhering to the type As the blank places in the form would not provide sufficient depth in the plate, it is necessary to build them up in the wax mould by dropping more melted wax in such places to a height corresponding to the depth required in the plate, which is, of course, the reverse of the mould, and will show corresponding depressions wherever the mould has raised parts. —  The Building of a Book A Series of Practical Articles Written by Experts in the Various Departments of Book Making and Distributing
• His plumbago-grey suit fitted exactly--save that it was perhaps a little tight. —  The Lost Girl
• Red hermatite, iron ore, traces of copper, and plumbago are found along the main Bitter Root. —  The Atlantic Monthly, Volume 17, No. 101, March, 1866

Allen's Synonyms and Antonyms

Used in the Same Context