Copy letter from Robert William Frederick Harrison to Professor W [William] E [Edward] Ayrton, Fellow of the Royal Society 'Dear Professor Ayrton, We yesterday telephoned our engravers about Mrs Ayrton's negatives. The said they would pack them and send them off at once. I hope therefore they are already in Mrs Ayrton's hands, but we will take care to enquire again to make sure they have gone.' 15 May 1908