These linear variable rheostats are mounted inside protective cover. The wire is wound on a ceramic tube. Three 4 mm safety socket terminals are provided for connection so the rheostat can serve as variable resistor as well as voltage divider.

With transparent cover, non-inductive visible winding, insulated support, with brass terminals. Square end supports. But with 4 mm socket brass terminals.

A heavy duty resistor (50W) of fixed value is mounted on a plastic base. 4mm sockets are provided for connections.

All plugs are turned to a fine standard taper and are interchangeable. These are moulded in fluted plastic tops. The brass blocks are undercut and are fitted to a thick insulating plate. Heavy 4 mm brass terminals are used. Coils are non-inductively wound and are treated to be strain-free. Coil values are engraved on the plate and an infinity plug is also included. Accuracy ±0.5% for 0.01 to 0.05 ohm coils, ±1% for the rest.

For rapid measurement and hard use. Each dial has a zero position and 10 steps, with fully aged constantan coils. Accuracy ±0.1%.