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to the vapors of hydrofluoric acid, which roughens the spaces between
the lines, and leaves the polish on the surface under the fat.|
A glass thus prepared becomes like a veil,
protecting from exterior indiscretion persons who, from their
apartment, desire to look commodiously inside.
We recall here that the manipulation of
hydrofluoric acid requires great prudence. This acid is so corrosive
that a drop of its vapor condensed produces upon the hand a lively
inflammation, and may even lead to graver accidents. Breathing
the emanations should therefore be avoided with the greatest care.
No art has been characterized, in the course
of its progress, by so much of wonder and undefined belief in the
supernatural, as that of the manufacture of glass in its various
modes and articles.
The old glass-works in Wellsburg, Va., were
pulled down a few years since with a tremendous crash. They were
erected in 1816, and, with the exception of the establishments at
Pittsburg, were the oldest west of the mountains. The beginning of
their career was prosperous, but the last owners have invariably