Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to [Frank Edward] Smith Esquire, FRS; National Physical Laboratory, Teddington Informs Mr. [Frank Edward] Smith that the National Physical Laboratory members have received their last copy of the 'Proceedings' at the reduced rate and it is now open to them to become ordinary subscribers through the Society's printers, Messrs Harrison & Sons. 20 December 1921