Working models for engineering students: Engine slide valves

[Title on box]: "Working models for engineering students. With descriptive letterpress by Thomas Jones . and T. Gilbert Jones. Being parts 1 and 2 of Thomas Jones's Working Models for Engineers. The book comprises eight models of engine slide valves. Series no. 1 & no. 2 ." [Manchester?]: Published by the authors, n.d. [Title on pamphlet:] "Working models for engineering students. Notes on engine slide valves (series 1 & 2). Fourth edition" London and Manchester: John Heywood, [1905?]. Eight working, color cardboard models of slide valves, with the 27p. pamphlet mentioned above, and advertising material for "Descriptive Geometry Models" (2pp. on pink paper) and "Special Engineering Publications" (4pp., dated April 1908). Good examples in original worn box (6 5/8 x 4 7/8"), printed paper labels. Series title: "Working Models for Engineering Students.".