To construct an oven whichcan be easily raised and lowered over the tubes and which could quickly produce a temperature of 300°F. Also, the room was air conditionedand the heat source must not introduce any more heat than necessary into the room. - A double-walled, thickly insulated, oval-shaped oven large enough to encompass four tubes was constructed. Heat source: three 1000-watt Chromalox Electric Tubular Heaters, formed to conform with the interior dimension and shape of the oven, are clamped to the sheet metal housing. Induction coils around the neck of the tubes heat up the metal parts inside, while the oven is heating the glass tubes and the air inside before evacuating air from tubes.

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