Sentence composition language teaching aid - illuminates lamp if sentence is incorrect and sounds buzzer if sentence if correct

摘要

The language teaching aid has a plastics surface on which are written columns of words which are be used in sentence composition. It has a phase selector by means of which one selects phrases to which are to be translated or composed. Each column of words is associated with a word cursor-selector which must be put in front of each chosen word. When all the words correctly respond to the selected phrase, by means of a push button an acoustic signal indicates that the phrase has been correctly composed. In the case where one or more cursors have been placed in front of an incorrect word by means of a pushbutton a luminous signal indicates that the phrase is incorrect.