The 12 V, 100 W heating coil wound on ceramic plate and is assembled between two insulated plates with aperture and two 4 mm sockets. Complete assembly is mounted on 150 x 8 mm rod.

Partly evacuated glass bulb 65 mm diameter containing a set of 4 mica vanes mounted on a pivot, one side of each vane blackened and reverse side is kept bright. When exposed to sunlight or bright lamp, the rotor rotates rapidly. Mounted on stand.

Sheet metal cube 125 mm side. The four faces of box are dull black, bright black, white and bright with opening at top.

To detect heat radiation, made of glass with bulbs approx. 30 mm, diameter, one bulb painted matt black, partially filled with ether.

It consists of 12 pairs of Bismuth and Antimony bars joined together in series with insulation between them. The couples thus arranged are enclosed in a brass frame having two terminals connected to the Bismuth and Antimony poles. Complete with nickel plated brass cone and mounted on an adjustable stand.