Abstract: A drive coupling for connecting a drive shaft to a driven shaft, comprising a first flexible disc connected to one of the shafts, a second flexible disc, spaced-apart from the first flexible disc, two solid members each connected to at least a respective one of the flexible discs, said two solid members being located between the flexible discs in overlapping relationship with each other axially of the coupling thereby to shorten the drive coupling.

Abstract: Measuring apparatus for measuring the quantity of calibration fluid delivered by engine-fuel injection apparatus, in which calibration fluid is passed into a hollow cylinder on one side of a piston to displace the latter in one direction along the cylinder and pressurized gas is passed into the cylinder on the other side of the piston to displace it in the other direction and so drain calibration fluid from the cylinder.

Abstract: A cam box assembly, especially for use with machines for testing fuel injection pumps, comprising a cam shaft in the assembly, drive transmission elements connected to the drive shaft, a first rotatable shaft having a drive connection with the transmission elements, a second rotatable shaft also having a drive connection with the transmission elements, a first flywheel mounted on the first shaft, a second flywheel mounted on the second shaft, the two shafts being co-axial with each other and being driven in opposite directions by the drive transmission elements whereby the flywheels likewise rotate in opposite directions, the flywheels being of identical mass.

Abstract: A precision positive displacement flowmeter for providing an accurate measurement of fluid flow at one end of a fluid circuit, comprising a cylinder and piston arrangement constructed to receive and emit circuit fluid continually, and an indicator arranged to give an indication of such flow by monitoring piston movement.

Abstract: Metering apparatus for measuring the quantity of fuel oil delivered by engine fuel-injection means when being tested on a test bench or other testing machine embodying or connected to the said metering apparatus, comprising transparent or part-transparent graduates having plungers or pistons within them which, in use of the apparatus, are displaced in one direction by fuel oil delivered from the injection equipment under test to the graduates, and in the other direction by fuel oil (or other liquid, if desired) delivered from a test bench or other source of supply, the plungers or pistons being readily visible so as to give a direct and accurate reading of the quantity of fuel oil delivered to each graduate.