Improvements in and connected with electrically heated boilers for heating tar and tar bitumen compounds

摘要

447,789. Electrically - heated tar 'boilers. MOLYNEUX, J., 236, Station Road, Bamber Bridge, near Preston, WILLIAMS, F., 21, Cannon Street, Preston, DEWHURST, H. H., Bank House, Pope Lane, and HOON, F., Greengates, Hollinhurst Avenue, both in Penwortham, Preston, and MOLYNEUX, G. S., 236, Station Road, Bamber Bridge, near Preston. Feb. 7, 1935, No. 3938. [Class 107] [See also Group XI] A boiler or tank for heating tar and tar compounds is provided with internal electrically-heated ducts k fitted with cross tubes l for circulating the tar. The boiler is fitted with a charging hole d and filter e, a pyrometer f, an inspection door c, lagging b, a discharge valve g for controlling the supply of tar to a circulating pump, and a return pipe leading to the top of the boiler.