The Colonial Blue Book shows that in 1840 there were only about one thousand hundredweight packages of plumbago or graphite exported from Ceylon.
"The Pearl of India"
Maturin M. Ballou
At one side an electric furnace was glowing with graphite crucibles subjected to terrific heat.
"The Air Trust"
George Allan England
On the floor at the base of the division are some noble pieces of graphite stoneware contributed by Mr. Frank A. Butler, who is deaf and dumb.
"Anecdotes & Incidents of the Deaf and Dumb"
W. R. Roe