Particle fluidisation and sedimentation chamber, shown towards the right of the image, is supported on a heavy aluminium plate and fixed to an extruded aluminium profile. A gas line leads into the pressure-reducing filter at the bottom and vacuumtubing leading to a vacuum pump extends from the hollow gas expander at the top. Cables extending from the device connect pressure transducers to a data-logging system. On the optical table are three high-speed phantom V10 cameras, positioned to have overlapping field of view inside of the apparatus, and the signal generator used to synchronise the three cameras via external triggering. LED spotlights are mounted near the apparatus for use as backlighting.