The physharmonica is a keyboard instrument fitted with free reeds, a kind of harmonium much used in Germany. It resembles a small harmonium, but is differentiated from it by having no stops; being without percussion action, it does not speak readily or clearly. As in the harmonium, the bellows are worked by the feet by an alternate movement, which also affords a means of varying the dynamic force of the tone according as more or less energetic pedalling increases or decreases the pressure of the wind supply. The physharmonica was invented in 1818 by Anton Haeckl, of Vienna; in the original instrument the bellows were placed right and left immediately under the shallow wind-chest, and were worked by means of pedals connected by stout wire. A Patent for Improvements to this type of Instrument ware granted by a Patent to Anton Reinlein 1824. Christian Friedrich Ludwig Buschmann also did build similar Instruments et least by the Year 1828. And the ware others who also did produce very early such instruments in German speaking regions of Europe. Johann Caspar Schlimbach with Bernhard Eschenbach, Carl Friedrich Voit in Schweinfurt and Friedrich Sturm in Stuhl.