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Telegraph reference?
I'm looking athttps://archive.org/details/noticedelavieet00prgoog/page/n187/mode/2upand I do not see any evidence that he claims to have actually built the device, a claim also supported over here:https://archive.org/details/cu31924031221249/page/n117/mode/2up... I think it was just a plan.Kristopolous(talk)17:24, 8 June 2020 (UTC)