Copy letter from Herbert Rix, to Joseph Norman Lockyer, Fellow of the Royal Society 'Dear Sir, The spectrum of "Bellatrix" in your paper on Uranite was a half-tone block done by the Direct Photo-Engraving Co. Shall we get the spectra for your paper on "8 Cephei" done in the same manner? Or have you anything else to suggest? I am, yours truly, H Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 19 November 1895