Copy letter from Robert William Frederick Harrison...
Referee report by J. A. Ewing on 'The Mechanism of...
Referee report by W. T. Astbury on ‘Divergent beam...
![Copy letter from Robert William Frederick Harrison, to Professor [Robert Bellamy] Clifton, Fellow of the Royal Society](https://dlc.services/thumbs/rs/2/NLB_22_787_001/full/252,/0/default.jpg)
