1The unpublished report ISS 62/7 dated 1 March 1962, prepared by M. Ageno and G. Missoni, clarifies (pp. 64-66) that the task assigned to the ISS group was to extract radiation from the synchrotron doughnut to test it and to make it available for a variety of physics experiments including biophysics; research on spectrography was being performed in cooperation with the French group, which had taken responsibility for setting up an appropriate spectrograph for spectral analysis of soft X-rays and the production of the monochromatic beam.

2Actually, the discovery of the absorption spectrum is another matter of historical controversy: Herweg may have preceded de Broglie by a few months, judging by the date of presentation of their papers (30 June versus 22 December 1913), but he gave up after the first unfavourable remark, whereas de Broglie persisted and perfected his work. However, quite likely, the first recorded `fine structure' is due to W. Stenström, in 1918.

3The first use of synchrotron radiation in Europe. Most technical work at Frascati was carried out by the technician Henri Ostrowiecki, a member of the French team; actually, he was the person who recorded the very first spectra on 6 May 1963 (personal communication).

4The description of the instrument and its schematic drawing [cf. Fig. 1 of Jaeglé (1966BB15); Fig. 1 of Cauchois et al. (1963aBB9)] fits well with the improved version of a bent-crystal spectrometer Cauchois had devised in the 1920s and was re-described, in a better modification, by Cauchois (1945BB8).