The rack and pinions are of cast steel, as is also the tiller crosshead.

Besides, the engine crosshead's worn and jumps about.

The syringe plunger is compressed by the crosshead at a set rate, and the force is measured.

The condensers form part of the engine frame, and have guide faces cast on for the crosshead shoes.

This long frame had to be made to accommodate the crosshead which was necessary for such a short cylinder.