Copy letter from an unknown correspondent, to Messrs Harrison & Sons 'In return to your memo. [memorandum] of the 16th., I think you may now proceed with the paper: casting type, if necessary, according to your promise by Mr. Colyer. If it should prove necessary to cast any of the smaller type that you have used in the formulae, please make it somewhat rounder, in accordance with Mr [Oliver] Heaviside's wishes; but it would not, of course, be worth while casting type on that account alone'. 19 January 1892