Crookes-type radiometer with spiral-shaped vane contained in a cylindrical shaped glass bulb. Mounted on circular dark wooden stand. radiometer
Crookes-type radiometer with two circle-shaped vane and two half-moon shaped vanes contained in a spherical-shaped glass bulb. Mounted on circular wooden stand. radiometer
Crookes-type radiometer. Contains two vanes of a rectangular shape contained in a spherical-shaped glass bulb. Mounted on circular dark wooden stand which has a crack in it. radiometer
Leslie differential radiation thermometer. Wellcome No. B947 Leslie differential radiation thermometer