No. 53285. 



Labial Pipes, Reed Pipes. 



429 



53 270. 1 : 5. 



53268. 1:10. 



53 272 A. 1:10. 



53 272 B. 1:10. 53278. 1:10. 



53 282. 1 : 10. 



53284. 



1 : 10. 



53.274. 3 Open Labial Pipes, of same length and same air capacity, but of different tone; d. 

 for explaining that the tone is also dependent on the shape of the pipe; one in the form 



of a truncated pyramid, the second of rectangular prismatic form, the third in the form 



of a pyramid trunk widening out upwards 1. 13. 



53.275. Tone Manometer, after Grimsehl (Ztschr. f. d. phys. u. chem. U. 2, 1888 89, p. 59), 



a U-shaped water manometer with valves for hanging in pipes 0. 6. 



53.276. Small Disc with rotary suspension, for showing the motion of air in singing air-columns, 

 after Grimsehl (Ztschr. f. d. phys. u. chem. U. 2, 1888 89, p. 59); it is placed, hori- 

 zontally, hung in the vibrating centre of a pipe I 0. 4. 



53.277. Steam Pipe (Bolte, Leitf. d. Phys., 2 nd Edn., Pig. 109), for placing on the wind chest 1. 10. 



53.278. Reed Pipe, Figure, with freely vibrating reed, tone varied by making the reed 



longer or shorter; with two resonators 0.18.0 



53.279. - - idem, with restricted-motion reed 0. 18. 



53.280. Free-vibrating Reed Pipe, after Weber 3. 0. 



This pipe is arranged in such manner as to render it possible to use reeds constructed of sheets 

 of different thickness and material. The pipe rests in a glazed wind chest and carries its pipe, which 

 can be interchanged by a whole series of others of different length; such a pipe is formed of two pipes 

 sliding one in the other. If the tone of the pipe harmonises with that of the tube, and if the pipe 

 is gradually lengthened, the tone is not lowered proportionally to this lengthening. The lowering takes 

 place slowly at first and then more rapidly until the lower octave exactly is reached when the tube is 

 drawn out double length. If now the tube be again increased by its own length the tone goes back first 

 to the initial pitch attained, being finally lowered as in the preceding case '- only, of course, by an 

 interval of a fourth. 



53.281. Membrane Reed Pipe (M. P. I, Fig. 777 and 778 [801 and 802]) 0. 5. 



53.282. Reed Pipe with Sound Trumpet, Figure, c_ x = 64 vibrations (ut x = 128 v.s.), powerful tone 1. 6.0 



53.283. - - i d e m, c = 128 vibrations (ut a = 256 v. s.) 1.6.0 



53.284. Horn with Reed, c : (ut 3 ), Figure, after Dvorak, for experiments on the mechanical 

 effects of sound (Ztschr. f. d. phys. u. chem. U. 6, 1893, p. 186) | 0. 4. 



53.285. Foghorn, model for placing on the wind chest (Bolte, Leitfaden d. Phys., 2 nd Edn., 



Fig. 109) 2. 5. 



Cl. 1097, 



5979, 1098. 1099, 1103, 1106, 3384. 



