Abstract: The drive system comprises a motor (10) to drive a glass gob producing feeder, a motor (18) to drive a gob distributor for distributing the gobs to sections of a glass container manufacturing machine of the individual section type, and a motor (34) to drive a container-removing conveyor. The drive means supplies electrical signals to cause the motors to operate at desired speeds. The drive system comprises a source (52) of a basic frequency signal which can be varied by varying means (54) to determine the speed of the entire production line, means (58) for producing a gob distributor controlling signal by dividing the basic frequency by a factor reflecting the number of machine sections, and means (62,66) for producing a conveyor system controlling signal by multiplying the basic frequency by a factor reflecting the number and spacing of the containers.

Abstract: A multiple-casing chimney with at least one smoke-carrying inner tube, one heat insulating layer surrounding the inner tube, and one jacket supporting the latter's outside. To prevent moisture saturation or tarring, the invention provides that flow paths for a venting gas supplied from the outside and discharged to the outside be provided within the base material of at least one casing (2, 4) surrounded by the jacket (6) and/or on at least one boundary between adjacent casings (2, 4, 6) between boundary surfaces formed by their respective base materials and be distributed over the circumference.

Abstract: An apparatus for testing the surface quality of a vessel mouth including a test head adapted to be placed over the vessel mouth, a line connecting the test head to a supply of test gas, a passageway through the test head for introducing gas into the vessel, and a pressure measuring instrument connected to the gas line for generating an electrical signal when a pressure change of a predetermined tolerance value occurs. A sealing washer of spring stiffness is mounted on the test head for bearing against the vessel mouth and a valve is provided in the test head to open the passageway when the washer is pressed against the vessel and to close the passageway when the test head is removed from the vessel. In addition, the sealing washer and valve may be pivotable and means for generating a fault signal may be provided for generating a signal when the washer has been pivoted a predetermined amount.