Vintage Harmonium, Reed Organ, free-reed keyboard instrument

I dont know much about this instrument. It appears to be functional. harmonium
, also called Reed Organ
, free-reed
that produces sound when wind sent by foot-operated
through a pressure-equalizing air
causes metal reeds screwed over slots in metal frames to vibrate through the frames with close tolerance. There are no pipes; pitch is determined by the size of the reed. Separate sets of reeds provide different tone colours, the quality of the sound being determined by the characteristic size and shape of the tone chamber surrounding each reed of a given set; constricted chambers, for instance, induce powerful vibration and incisive tone. Volume is controlled by a knee-operated air
or directly from the bellows pedals by an expression
that allows the wind supply to bypass the reservoir. The instrument’s compass is normally four to five octaves.
The earliest instrument of the harmonium group was the physharmonica, invented in 1818 by Anton Haeckl in Vienna. His invention was inspired by the Chinese mouth
, or sheng
, which, taken to Russia in the 1770s, had introduced the free reed to Europe and aroused the interest of certain physicists and musicians. Now extinct, other types (such as John Green’s seraphine) appeared before Alexandre Debain produced his harmonium in Paris in 1840. The main improvements after 1850 were made by Victor Mustel in Paris and Jacob Estey in the United States.