Display label, isochronous regulator, exhibited by MM. Richard Frères Explanatory text used for an exhibit at Burlington House, during the Royal Society's conversazione of 14 May 1890. Text reads: 'The Royal Society 1890. Exhibited by MM. Richard, Frères, Paris. Isochronous regulator for electric contacts.' The label has a red ink border and highlighting to the 'T', 'R' and 'S' of The Royal Society. The label was re-purposed: the reverse has a table of attendees at the Royal Society's Committee of Papers, 1890-1891, with dates of attendances. 1890