An otheoscope Product:Framed picture The Queen (centre) seen here

The Queen (centre) seen here with Princess Margaret

9 November 1837

1801) Inscribed below the image: 'W

'The brilliancy of Venus [top left of image] was a spectacle which was naturally contemplated as in harmony with the rest of the day

An otheoscope Product:Framed picture The Queen (centre) seen hereAn otheoscope with fixed vanes of oxidised copper and coloured disc above it. An instrument designed for measuring the mechanical effect of radiant energy, a modification of the radiometer. Mounted in a partial vacuum, the central rotor spins when the vanes are exposed to light. Chemist William Crookes (1832 1919) initially believed the vanes with black surfaces were pushed around by pressure from light radiation. This was incorrect and other theories