Georg Forchhammer

Johannes Georg Forchhammer (22 May 1861 to 23 July 1938) was a Danish educator who specialized in deaf instruction and directed several deaf schools in Nyborg and Fredericia from 1891 to 1926. Originally trained as a chemist and physics teacher, he moved into deaf education and became known for creating one of the first mouth-hand systems, a manually coded approach used to teach Danish to deaf pupils, which remained in use through the twentieth century and was later adapted for German instruction. He also invented the phonoscope, a device that helped deaf students verify correct vowel pronunciation, and completed a doctorate on deaf communication in 1903.