638 



THE POPULAR SCIENCE MONTHLY 



in the accompanying plan will give the reader an idea of the 

 modern improved organ, its wonderful mechanical and acoustic 

 features, which involve such interesting complications of pipes, 

 sound-boards, bellows, and draw-stop, mutative stop, manual and 

 pedal action, through which one individual — the organist — can 

 control a great domain of musical resources at one time. 



The present organ is in singular contrast with the organ of 



J^'IG. 17. 



Fig. 19. 



Fig. 22 



Fig. 18. 



Figs. 17 to 22. — Eepresenting Constructive Principles of a Mason and Hamlin Organ. 

 Ficr. 17 shows position of reed ; Fig. 18 represents in sectional elevation part of one end 

 •with reed-valves and stop action ; Fig. 19 shows auxiliary mutes ; Fig. 20 exhibits method 

 by which the stop-valve is mounted : wind-chest ( U), reed-valves (/), stop-valves ( T'), 

 swell-cap (F) with the swell-lids attached (TF), stop-lever (X), transverse roller-lever 

 (5'), roller-board (0'), name-board (a'), draw-stops (a and 6), and the tube-board {K). 

 Some connections of the parts are indicated thus: Tlie inner end of stop- valve [T) 

 attached to tube-board {U) by butt-hinge fc) ; similar hinge {d^ fastened to outer end of 

 tube-board; stop-valve {T) joined to half hinge (//) by the bent wire {e) ; connection of 

 bent wire (e) with stop-lever (X) by the link (?/) ; brass incline (17) on stop-lever (X); 

 also connection of stop with valve (P) at the back of tube-board \R). Figs. 21 and 22 

 represent relative parts according to exemplification. 



past centuries. As a musical instrument, presided over by one 

 mind, it is incomparably ahead of any other musical medium 

 known, in the extent of its development, aside from its capacities 

 in the artistic sphere. To dwell for a while upon its construction : 

 Pipes in the organ are of two kinds, wood and metal, and of two 

 acoustic classes — namely, reed and flue. The grouping and ar- 

 rangement of the huge body of pipes which enter into the compo- 



