Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society 'Dear Professor Ayrton, Pray thanks for the trouble you have taken over the matter of the typewriter. I think we have pretty well decided upon the improved Remington. I note the correction in Dr Fleming's initials. I have sent your plates to be corrected, & as soon as you let us know the number of copies wanted, we shall print off. Yours truly Herbert Rix Asst Sec RS [Assistant Secretary, Royal Society]'. 23 November 1891