First edition, first printing [1930]. 138pp, with illustrative diagrams in text. Red cloth-covered boards, with gilt titles on spine. 12mo. Corners and spine ends lightly bumped, some fading along spine ends and top edge of front board and foxing on text block edges. Some toning on endpapers. Dust jacket has tears and wear to edges and spine with some chipping and loss and some staining on the spine and internally.
