282 
INDEX 
Gericke, Wilhelm, 61, 71. 
Girgenti, Cathedral of, 255, 264. 
Greek Theatre, 5. 
Guastavinc, Raphael, 208. 
Harmony, Helmholtz’s theory of, 109. 
Harris Theatre, Minneapolis, 194. 
Helmholtz, “ Tonemfmdungen,” 107; 
theory of harmony, 109. 
Henry, Joseph, 122. 
Herschel, Sir John W., 255, 264, 272. 
Higginson, H. L., 62, 71. 
Ingalls and Hoffman, 174. 
Institute of Musical Art, New York 
City, 237. 
Insulation of Sound, 237. And see 
Transmission of sound. 
Intensity of sound, 150, 277; minimum 
audible, 37; initial, 42; distribution 
of, 152,168, 233; And see Loudness. 
Interference of sound, 5, 148, 150, 151, 
164, 219, 232. 
Jefferson Physical Laboratory, Harvard, 
Constant-temperature Room, 6; Lab¬ 
oratory, 30, 32, 50; Lecture Room, 
18, 30, 32, 50. 
Jenney, W. L. B., 126. 
Johns-Man ville Company, H. W., 132. 
Kuppel-horizont, 166. 
LeClear, Gifford, 16. 
Leipzig, Gewandhaus, 61, 64, 65, 71. 
Little Theatre, New York City, 174. 
Los Angeles, Cathedral of, 79. 
Loudness, 81, 150. And see Intensity of 
Sound. 
Loudness, sense of, 129. 
Louvre, Paris, Salle des Cariatides, 255, 
270. 
McKim, 62, 117. * 
McKim, Mead, and White, 60, 71, 131, 
200. 
Mean free path, 39, 43; relation of, to 
volume, 41. 
Melody, 111. 
Melody and the origin of the musical 
scale, 107. 
Metropolitan Museum of Art, Lecture 
Room, 138. 
Missouri State Capitol, 273. 
Mormon Tabernacle, Salt Lake City, 
261. 
Music Hall, Boston, 3, 64, 65. 
Music Hall, Baltimore, 71. 
Musical taste, accuracy of, 71. 
New England Conservatory of Music, 
Boston, 72, 237. 
New Theatre, New York City, 144, 177, 
236. 
Open-Window unit, 23. 
Partial tones, 109, 112. 
Pitch, variation in, affecting reverbera¬ 
tion, 78; affecting loudness, 81; af¬ 
fecting quality, 81. 
Quality of tone, 81; effect on, of audi¬ 
ence, 82; of construction, 82. 
Rayleigh, Lord, 272, 277. 
Reaction of room upon source, 277. 
Reflection of sound, 148, 150. 
Reid, Dr. David B., 125. 
Residual sound, rate of decay of, 34. 
And see Reverberation. 
Resonance, 7, 206, 219. 
Reverberation (duration of audibility), 
9, 10, 80, 114, 153, 154, 170, 219, 220; 
calculation of, 25, 103; constants of, 
20 (variation of, with volume, 32, 33, 
with initial intensity, 42), 43, 45, 47, 
48, 49, 50, 51; effect on, of area of 
absorbent, 22, 23, of an audience, 84, 
155, of brick wall-surface, 87, of 
pitch, 78, of position of observer, 17, 
18, 31, of shape of room, 136, 139, 
of temperature, 124, of ventilation, 
117, of viscosity of air, 54. 
Reynolds, Osborn, 122. 
Rhode Island State Capitol, House of 
Representatives, 135. 
St. John Lateran, Rome, 255, 266. 
St. Paul’s Cathedral, Detroit, 141. 
St. Paul’s Cathedral, London, 255, 272. 
Sanders Theatre, Harvard, 30, 32, 71.