Röntgen's secret experiments in November and December 1895 were first announced in the first paper, written in December 1895, and published simultaneously in the journal (as here) and in offprints (dated "Ende 1895" and in printed wrappers). The second part of the paper was published in the same journal in March 1896, containing confirmation of some earlier suppositions due to further experimentation, and some refinements to the equipment used. It also contains the famous photograph of the hand of Röntgen's colleague, Professor von Kölliker, which was made during Röntgen's only public demonstration of his discovery, in late January 1896 (this photograph was not reproduced for the offprint).
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