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Copper cylindrical vessel 180 x 115 mm with steam vent and a vertical tube terminating in chute passing through side of vessel. A brass tube sliding fit in the central tube, with lower angle cut to seal the chute, enables heated material to be transferred to calorimeter without loss of heat.

A horizontal frame is mounted on a rod fitted to a base & carries a steel wire stretched across it, the tension of which can be adjusted by a tightening screw. A light weight metal pointer with a counterpoise is attached to the centre of the wire by a clamp. A pan is hung from a notch in the pointer and has a hook at its underside from which can be suspended a light weight rectangular frame or a metal clip to hold a micro slide edge. The tip of the pointer moves over a graduated scale. With rectangular wire frame, slide clip, six micro slides and 3 meters of spare wire.

Plastic pulleys of diameter 38 and 50 mm mounted on brass bearings and set in steel frames with hooks at the top and the bottom

For measuring velocity and acceleration. A vibrating striker prints dots on the tape using carbon disc. The unit is housed in a sturdy plastic case, works on 6-9 V DC, producing 25 or 40 dots per second.