Russian
класс музыкальных инструментов Portuguese
família de instrumentos Catalan
família d'instruments Spanish
clase de instrumentos Grouping of different but related types of instruments.
1
To-day we add to the list then given a class of instruments invented by us, examples of which are now before you on the table.
2
Other kinds of electric apparatus may be hereafter invented, and I hope to construct some not belonging to the class of instruments discovered by Volta.