Radiometer Economy

Radiometer with four lightweight metal arms.

Includes black and white vanes in color
Mounted on round plastic molded base
Glass bulb with 70 mm dia.

Comprising partly evacuated glass bulb approx. 70 mm diameter, containing at its center a fine pivot which supports four light weight metal arms. One side of each vane is blackened, the reverse side is bright. Mounted on round plastic molded base.