Flying and Some of Its Mysteries by V E Johnson MA ,Author of The Theory and Practice of Model Aeroplaning and the Gyroscopic Control of Aeroplanes,undated,but appears to date from around the 1910s,fading to spine,otherwise VGC. 138 pages.
Superd edwardian science book,packed with projects on model ballooning,fire balloons, gas drift balloons,dirigibles, kites,model helicopters,aeroplanes (mono and biplanes) with many delightful period illustrations. Emphasis on balloons,which I believe were seen as the "coming thing" at this time! Very scarce book.