A Laboratory High Vacuum Furnace

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Abstract
The authors have reported the details of construction and operation of a carbon tube resistance furnace which operates in high vacuum (10−3 to 10−5 mm) or special atmospheres. The furnace has the following advantages: relatively low cost, compactness, and rapid heating. Melts of 25 grams are made at 1550° in 6 minutes. Larger melts and higher temperatures should be easily attainable. When operated under vacuum the furnace produces melts that are practically gas‐ and carbon‐free. A marked freedom from the usual difficulty of maintaining vacuum has been achieved by using the base of the furnace as an electrode, thus reducing the number of entrance ports, and by using vacuum rubber‐tape to seal flexible connections.

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