< Page:Popular Science Monthly Volume 39.djvu
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GLASS-MAKING.
627
been added, is rubbed over the tube. In a few moments the glass is sufficiently bitten. The tube is washed with water and the wax removed. The lines and figures are then blackened with varnish, and the thermometer is ready for use.
It must not be supposed that the same care is employed in the
Fig. 6.—The Dividing-engine.
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