|Alternative reference number
|Copy letter from [Herbert Rix], to Mr Collings, 172 Strand
|7 October 1891
|'I suppose the enclosed sheets illusts [illustrations] criticised by Prof Ayrton [Professor William Edward Ayrton] are zincos. Please tell me whether the faults he finds are due to rough proof and hasty printing, or whether they will need new blocks to rectify the defects'.