Pollard: Eleven Autograph Letters Signed (all 'Alan Pollard.') to G. K. Menzies, Secretary, Royal Society of Arts. Walker: Two Typed Letters Signed (both 'Emery Walker') to S. Digby of the Royal Society of Arts. With 23 printed diagrams.

Pollard's eleven letters: one 12mo (1 p); the other ten 4to (eight 1 p and two 2 pp). The first has a small spike hole affecting one word, otherwise the collection is in good condition. Four docketed and seven bearing the Society's stamp. Pollard was 'Professor of Instrument Design (Mechanical)' (later 'Optical Engineering') at Imperial College, and the correspondence relates to the publication of his 1922 Cantor Lectures to the Society on 'The Mechanical Design of Scientific Instruments'. Emery Walker's two letters: both 12mo, 2 pp (one of 15 and the other of 19 lines). Both good, but with the second letter carrying a paper-clip rust stain at head. Both on the same attractive letterhead, on which the firm is described as 'Process and general engravers, draughtsmen, map constructors, copper-plate printers, collotypers and photographers of works of art'. The second letter carries the stamp of the Royal Society of Arts. The letters concern the obtaining of blocks for Pollard's lectures 'from the Cambridge University Press and from "Engineering"'. The Diagrams accompany a letter by Pollard of 5 June 1922, in which he writes that he is enclosing 'the diagrams that have been prepared by "Engineering" for the abstract of the Cantor Lectures they are publishing & for which you gave permission.' He feels that if the Society could 'make use of these blocks [...] it would enable several more diagrams to be included in the printed lectures & thus greatly increase their value'. The diagrams are on separate pieces of paper, mostly between 3.5 and 5.5 cm square, laid down on the blank reverses of one or the other of two proof sheets (each 36 x 26.5 cm) of the 6 January 1922 issue of 'Engineering'.