Letter from Thomas Edward Allibone to D C Martin, concerning two papers: 'Theory of the growth of the high frequency electrodeless discharge' by G Francis and A von Engel, and 'Measurement of the growth of the high frequency electrodeless discharge' by G Francis and A von Engel Paper reference code: A.169 and A.170 Written at Netherwood, Garden Close Lane, Newbury, Berkshire [England]. [Both parts published together in Philosophical Transactions A, 1953, with an additional author credit for Frederick Alexander Lindemann]. Date received not given. 1 January 1963