Wanostrocht was the proprietor of a school in Camberwell, an accomplished amateur painter, and one of the leading left-handed batsmen of the 1830s and 1840s. He played under the name 'Felix' to disguise his cricket activities from the parents of his pupils. Felix on the Bat, first published by Baily Brothers of London in 1845 and reissued in expanded editions in 1850 and 1855, was a 96-page coaching manual on the art of batting. It included Felix's own lithographed illustrations of stance, forward play, the cut and the leg-glance — the first systematic visual treatment of cricket technique in print. Felix had also invented a 'catapulta', a mechanical bowling device of Indian rubber that would propel a ball at a batsman, and the book gave the first published description of using a bowling machine for net practice. Felix's terminology — forward, back, the cut, the draw, the leg-glance — was adopted by every coaching writer who followed, from John Nyren onward. The book, with its plates of Alfred Mynn, Pilch and Lillywhite in their playing styles, is now one of the most valuable cricket books of the nineteenth century.