|Description||Sectional Committee: Physics|
Recommended for publication in the 'Proceedings of the Royal Society of London'. The Secretary has consulted with the President, and believes the paper can be accepted without report. If a report is preferred, please can a referee be suggested. Richard Whiddington agrees to publication without report.
[Published in the 'Proceedings of the Royal Society of London']
Endorsed on recto as received 15 April 1939.