Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . movable di-aphragm d of the double-acting bellows is operated,alternately fon/ing th air through tlie jiipes r r intothe wind-chest /, from which it is distributed by thetrunk g to the organ bellows /. The wheel i is con-nected with a wire that controls the lever k of thegoverning valve of the water-supply pipe. As thebellows h becomes inHated, the block on its
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . movable di-aphragm d of the double-acting bellows is operated,alternately fon/ing th air through tlie jiipes r r intothe wind-chest /, from which it is distributed by thetrunk g to the organ bellows /. The wheel i is con-nected with a wire that controls the lever k of thegoverning valve of the water-supply pipe. As thebellows h becomes inHated, the block on its upperlid strikes against the lever w, closing partially orentirely the valve, and automatically regulating thesupply of air to tlie demand. By means of a hand-wheel ), which can be conveniently reached by theorganist, a valve k is opened or closed for admittingor cutting off the water sujiply. In this engine thecrank is dispensed with, and the valve-gear so ar-ranged as to prevent sto|ipage on the dead centers. A number of reed instruments are called organs,being on the accordeon or nielodeon principle, freereeds playeil by keys in one or more banks. .Suchare known as cabinet, parlor, and small choir organs. Fig. LascdVs Organ-Blowing Apparatus (Dr. Partridge^s Church,Brooklijn, N. r.). Pipe organs are also made of a cabinet size. Thehand or barrel organ is also a iiijie organ in whichthe keys are moved by pins (staples) on a barrel movedby a crank, the arrangement of tlie pins being on asimilar principle to that of a musical-box. The electric organ is one in which the valves ad-mitting air to the pipes are opened and closed byelectro-magnetic action. The general arrangementis as follows : — Each key has a separate insulated wire, the cir-cuit through which is closed by depressing the key,causing a connnunicator to dip into a minute cuji ofmercury, the current thus established exciting electro-magnet that attracts a pallet or keeper,by which the valve is opene
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