Photoheliographs

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        Photoheliographs

        Photoheliographs

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          Photoheliographs

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            Photoheliographs

              3 Archival description results for Photoheliographs

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              The letter was an enquiry with reference to the Photoheliograph which was received on loan from Greenwich Observatory, whether to return it or it may be completely dismantled and the parts used for other purposes in our research work.

              Evershed, John