Friday, 24 April 2009

Tuesday April 24, 1894

Photoheliograph taken off the 28 inch. – Instrument rebalanced.

Frank Dyson, Chief Assistant

RH says..... There were several photoheliograph telescopes at Greenwich - used for photographying the sun, as the name suggests - but I'm not sure which one this was and how long it had been attached to the 28-inch telescope. An earlier entry shows that one Dallmeyer Photoheliograph was mounted on the roof of the New Physical Observatory, while the Thompson 9-inch photoheliograph was presumably still attached to the Merz 12.8 telescope in the Lassell Dome.

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