Spring Scale

Steam heated, with 230 x 25 mm copper bar, with a steam chamber at one end, the other end having a copper coil for cold water with inlet and outlet tubes. With two thermometer pockets. In box with insulated lagging, removable cover, without thermometers.

Showing internal structure and operating principles of a simple piston air cooled two stroke engine, Mounted on a polished wood base with schematic diagram, overall height 360 mm approx.

As above but with two sets of mica vanes placed in two separate bulbs, blackened in such a way that rotations are in opposite directions.