Apparatus for the educational teaching of letters and guarisms with formation of syllables and quantities (Machine-translation by Google Translate, not legally binding)

摘要

Improvements introduced in the main patent no. 197,211 characterized in that in the base cover of the apparatus described therein are located rollers mounted on axes which in turn are mounted on suitable pieces that have two lateral ears for support of the terminals of the shafts and a perforation in a posterior ear through which a conveniently adjusted rod is passed whose rod is threaded and leaves the outside of the box or cover where it is adjusted by means of a hand-operated butterfly nut in order to advance or backing the support with its corresponding roller thus allowing to tension or distend the band mounted on the mentioned roller. (Machine-translation by Google Translate, not legally binding)