operating, and suitable furnaces, which will hereafter be de- any locality at any desired time. It is composed of a mercu- impunity. scribed. rial thermometer, curved in inverted V shape, and fixed on a It is claimed that there is no difficulty in polishing the In carrying out the process, it is… … larly forflat glass, the floor of the oven is REGISTERING THERMOMETER. made to cant, so that, when the glass is heat- —_—q@So——_——— THE BASTIE TOUGHENED GLASS, tals and other articles exhibited. It may be etched with ed on it, it is turned to a sloping position, and the glass slides We recently…
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