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Provenance of Gaede pump

Inv. 97103 is a Gaede pump (ser. no. 2670) by E. Leybold's Nachfolger.

Its manufacturer's test certificate survives in MS Museum 191 (the instrument book of the Balliol-Trinity Laboratory) along with a typescript operating note from the manufacturer (pp.38v-39r). The certificate is dated 17 January 1910.

Edmund J. Bowen records that Moseley borrowed a Gaede pump from the Balliol-Trinity laboratory when he returned to Oxford in 1913 ("The Balliol-Trinity Laboratories, Oxford 1853-1940", Notes and Records of the Royal Society of London, Vol. 25, No. 2 (Dec., 1970), pp. 227-236, p. 231). This is evidently the one. Moseley himself notes in Part II of his "High-Frequency Spectra of the Elements", Philosophical Magazine 27 (1914), 703-13, p. 704 that "The X-ray tube, which has a capacity of over 3 litres, was exhausted with a Gaede mercury-pump. for the loan of which I am indebted to Balliol College".

As the pump was transferred to the Museum from the university's Electrical Laboratory along with other Moseley material, it was evidently not returned to the college laboratory.

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