Abstract: A hollow flexible joint (10) for connecting two pipes (6, 8) in an engine exhaust system, which includes two or more tubular coupling members (12, 14) adapted for connection between the pipes (6, 8), the tubular members (12, 14) each being sealingly and pivotally engaged with another tubular member (12, 14), and two of the tubular members (12, 14) being engageable with a respective adjacent end of each of the pipes (6, 8). The joint includes three or more pairs of part-spherical mated sealing surfaces (11a, 11b, 11c), and can remain gas-tight even when one of the pipes (6, 8) articulates universally relative to the other.

Abstract: A viscometer in which the angular position of an element responsive to the viscosity of a liquid, the viscosity of which is to be monitored, is sensed by a magnetic resistive sensor adapted to supply intermittent electrical signals to an electronic means recording the angular position.