11. In Paris he painted much and also tried his hand successfully at wood engraving . 12. Walker's medium is wood engraving , predominantly printed graphic novels that tell stories without dialogue. 13. He taught evening classes in wood engraving at the Slade. 14. He vetoed the introduction of the new style of wood engraving into the curriculum. 15. He worked in a variety of genres : painting, etching, wood engraving and illustration. 16. He was also an influential proponent of wood engraving and woodcuts as art forms. 17. His contribution to wood engraving in Ecuador is equally important. 18. Juengling was identified with what was known as the new school in wood engraving . 19. Mary and her sister Leila established a wood engraving studio. 20. By the mid-1890s, halftone printing had largely replaced wood engraving in the publishing industry.