Undated, but previous owner’s name to title page shows date of Jan. 1917. Pictorial card covers, 3 pages of publisher’s catalogue at front, frontispiece from photograph (The Wright Aircraft at Pau), Preface etc to viii, then 4 plates (airships), 135 pages of text with occasional diagrams etc in run of text and more plates illustrating aircraft, from photographs. Two more pages of publisher’s advertisements at rear. Chapters are: Introduction, Dirigible Balloons, Flying Machines, The Art of Flying, Flying machines of the Future. Small paperback, about 7.25 inches high. Condition: Covers soiled, creased and worn, pages age-darkened, margins of some pages soiled, plates intact but at least one has soiling to the margin and light soiling/shadow to the image. Previous owner’s name to title page.