An otheoscope Product:Framed picture 9 November 1837

9 November 1837

The Chinese Building and Rotunda in Ranelagh Gardens

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

Figure 1 'The Bull-Beetle

An otheoscope Product:Framed picture 9 November 1837An 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