 Upon ML Pin 's return from Europe in 1931 , Public Instruction Minister Prince Dhani <unk> appointed him as a government official under Krom <unk> , a department of the ministry . He also served the prince in a somewhat unofficial capacity , assisting the prince 's work and observing the ministry 's various goings @-@ on . Under the prince 's directions , ML Pin became an instructor in mathematics , Thai , and English at Chulalongkorn University , in addition to the various duties he performed for the ministry . In 1934 , he became head of the university 's teacher @-@ preparation programme and headmaster of the <unk> Secondary School of Chulalongkorn University , which served as the country 's first demonstration ( teacher training ) school . He began developing projects for the school , although few of them were realised at the time . One such project was the creation of the country 's first school workshop . 
