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Updated: June 2, 2025
I repeated my objection. "Well, you know," he replied, "you must keep your cell clean." "Yes," I rejoined, "and I do keep it clean for my own sake; but your blacklead is dirt." That ended the conversation, and the blacklead question was never agitated again, although once or twice, during my absence from the cell, the obnoxious stuff was put on the floor and polished up by one of the cleaners.
This answers a triple purpose; it coats the mould with graphite, wets it ready for the bath, and expels air bubbles from the letters. This process prevents entirely the circulation of blacklead in the air, which has heretofore been so objectionable in the process of electrotyping.
The process of electrotyping is as follows: The form is locked up very tightly, and is then coated with a surface of graphite, commonly known as blacklead, but it is a misnomer. This is put on with a brush, and may be done very evenly and speedily by a machine in which the brush is reciprocated over the type by hand-wheel, crank, and pitman.
There his powers of drawing failed him; moonlight on Snowdon was too vague a subject for the blacklead point but a hint of it could be conveyed in rhyme: "Folding like an airy vest, The very clouds had sunk to rest; Light gilds the rugged mountain's breast, Calmly as they lay below; Every hill seemed topped with snow, As the flowing tide of light Broke the slumbers of the night."
But what I should like you to remember is that geologists of our own time tell us that the lowest layer of the earth's crust which has yet been explored appears to be made of vegetable remains, so crushed and altered by time and by the tremendous pressure of rocky layers lying above it, that though it is probably of the same material as that which forms the coal-measures, it resembles the blacklead of which pencils are made much more than the coal which you know is what has been formed by the decay of buried forests and jungles.
On Monday, and on Monday only and you were helpless for the remainder of the week if you forgot the rule you could obtain, on presentation of a chit, blacklead for the stoves, metal-polish for the brass, rags for cleaning the floor, floor-polish, one box of matches, bath-brick, soft soap, and soda. It is an extraordinary chemical, soda.
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