Locomotive design showing croSS section of the piston and sliding valve as positioned in the steam chambеr (Cylinder), clearly visible through air tight glass front and movement of these parts are smooth enough to demonstrate working even by blowing, Other parts are also clearly visible such as crankshaft, valve control, drive wheel etc.

To demonstrate principle of lead/acid accumulator. Glass jar, 250ml with plastic screw cap, carrying 4mm socket terminals fitted to two lead plate.