In our presentation we want to portray the life work of five teachers who in the first half of the 20th century not only recognized the need for holistic and autonomous learning but promoted it in a decisive way. All five of them developed tools for teaching - albeit in individual ways - and thereby contributed crucially to the quality and the process of modernisation of our schools. Starting from their point of action in the canton of Thurgau in Northeastern Switzerland, they gained both national and international recognition. Johannes Eberli (1860 - 1928) was a science professor at a school for future teachers and developed a Science Experiments Kit for primary and secondary school, accompanied by a practical instruction manual. August Bach (1869 - 1950) founded a correctional school and succeeded in turning it into a model school. He developed teaching tools and measuring instruments for mathematics and physics classes in primary and secondary school. Wilhelm Fröhlich (1892 - 1969) gained worldwide recognition for his KOSMOS Science Experiments Kits for school and home. Paul Eggmann (1904 -1985) came up with a system to build your own Science Experiments Kits and for decades, shared his ideas with scores of other teachers. Eugen Knup (1898 - 1987) was fascinated by the radio. He wrote instructions and developed gadgets to promote knowledge about the physical and technical basics of this new medium. The main focus of the presentation will be on August Bach and Wilhelm Fröhlich. The School Museum of Amriswil is dedicating a publication with the title "Thurgovian Pioneers of the Science Experimenting Kits" to those five school teachers.