The _Revue Industrielle_ gives the following method of drilling holes
in glass: First, prepare a saturated solution of gum camphor in oil of
turpentine. Then take a lance-shaped drill, heat it to a white heat, and
dip it into a bath of mercury, which will render it extremely hard. When
sharpened and dipped into the above-named camphor solution, the tool
will enter the glass as if the latter were as soft as wood. If care be
taken to keep the spot being drilled constantly wet with the solution,
the operation will proceed rapidly, and there will rarely be any need of
sharpening the tool.
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A catalogue, containing brief notices of many important scientific
papers heretofore published in the SUPPLEMENT, may be had gratis at this
office.
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