The Department of Education, in addition to the teaching and education of the blind of suitable age, shall adopt measures and prescribe rules for the giving of vocational training to the pupils at the school, in order that they may be equipped upon their graduation to engage in occupations or industries by which they may become self-supporting. The board shall determine the nature and scope of the vocational training, with the view of best adapting the blind to follow useful and productive pursuits, after the completion of their education.