Copy letter from Herbert Rix, to Mr Collings Rix has heard from Mr [Frank Watson] Dyson that the ordinates and abscissae of his curves need not be shown, that the differences in the thickness [of the curves] was accidental and is not to be expressed, and that the scale may be anything that is convenient. Asks Collings to proceed with the six diagrams and encloses five herewith [not attached], the sixth already being with Collings. Dyson is anxious to have a proof in a weeks time and Rix therefore begs all haste to be made with the cuts as they cannot begin the letter-press until they are ready. Presumes the 12 diagrams to be engraved the same size are already done. 29 September 1892