London: Offices of Engineering, 1932. Stapled wraps. Quarto. 7 pages pages. Good. Top and bottom edges of this tall booklet have been trimmed unevenly. Does not affect text or content. Has been folded vertically a couple of times, leaving the booklet creased in a few places.
Interesting article reprinted from "Engineering," April 15 and 22, 1932. Includes photographs and an unpaged centerfold showing various scaled elevation drawings of the catapult from different perspectives.