| Description | Paper reference code: A.93 
 Refers to referee's report and previous correspondence [see RR/W/6/42 and RR/W/6/45]. Asks when the paper will be published.
 
 [Not published in RS journals but published in Proc.Nat.Inst.Sci.Ind., 5, No.2, 1939].
 
 Received 21 October 1938
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