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232 THE AUSTRIAN YELLOW.
safely
performed, the diamond is next fixed into a handle and is so imbedded
in a soft cement as to leave exposed only that portion which is to be
ground. By means of another diamond
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similarly
imbedded in a handle it is worked down to the requisite shape. The dust
from the two grinding diamonds is carefully saved and is used for
polishing them. This process is effected by means of a disk of soft
iron about a foot in diameter, coated with the diamond dust
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