Copy letter from Herbert Rix, to Mr Collings 'Inclosed herewith is a third figure for Lord Kelvin's paper. Please execute the cut in the same style as figs [figures] 1& 2*, and let Messrs Harrison & Sons have it by Friday morning. (* I forget whether these were b. on w. [black on white] or w. on b. [white on black])'. 19 July 1893