|Alternative reference number||NLB/53 p40|
|Title||Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Richard E. Pennoyer Esq., American Embassy|
|Date||31 March 1916|
In answer to your enquiry concerning a paper on Tensile Stresses tested by Polarized Light, I beg to say that the paper you have been told of is probably the Friday Evening Discourse delivered by Professor Coker at the Royal Institution on February 18. Application at the Institution (Albermarle Street) would no doubt furnish you with further information and possibly they may already have an abstract of the lecture in print.'