1022.    ---------------.  [Aluminum Oven for Contact Reactions.]  Ztschr. angew. Chem., vol. 40, 1927, p. 1204; Brennstoff-Chem., vol. 8, 1927, pp. 323-324; Ges. Abhandl. Kenntnis Kohle, vol. 8, 1929, pp. 308-310; Chem. Abs., vol. 22, 1928, pp. 701, 1253.

        The block oven is an Al rod 500 mm. long and 80 mm. diameter with a central longitudinal hole 24 mm. diameter and is insulated with diatomaceous earth and heated with gas burners with automatic temperature control.  The segment oven differs in having the tubes cut into 10 segments separated by asbestos plates so that each segment may be held at a different constant temperature.  An Ostwald thermoregulator keeps the temperature constant.  Because of high heat capacity and condition of Al. the temperature can be held uniform (within 1° at 240°) throughout the length of the bore.