APPENDIX
12. Scheibler’s tonometer (37). Helmholtz, Sensations of Tone, pp.
199, 443.
13. Koenig’s tonometer (37). Zahm, Sound and Music, p. 74.
14. Lissajous’s figures (20, 37). J. Lissajous, Comptes Rendus,
Acad. Sei. Paris (1855). Winkelmann, Akustik, S. 42-59. These fig¬
ures were described by Lissajous in 1855, but they had been previously
described by Nathaniel Bowditch, of Salem, in 1815; Mem. American
Academy of Arts and Sciences, 3, 413 (1815). J. Lovering, Proc.
American Academy of Arts and Sciences, N. S. 8, pp. 292-298.
15. French pitch (38). R. Koenig, Quelques Expériences, p. 190;
Annalen der Physik, 9, 394-417 (1880).
16. The clock-fork (38). Niaudet, Comptes Rendus, Acad. Sei.
Paris, Dec. 10 (1866). Koenig, Quelques Expériences, p. 173.
17. Flicker (44). S. H. and P. H. Gage, Optic Projection, Ithaca
(1914), pp. 423-427.
18. Highest audible sound (45). R. Koenig, Annalen der Physik,
69,626-660, 721-738 (1899).
19. History of pitch (49). A. J. Ellis, Appendix Helmholtz’s Sen¬
sations of Tone, pp. 493-513.
20. Musical pitch in America (49). Charles R. Cross, Proc. Ameri¬
can Academy of Arts and Sciences, 35, 453-467 (1900).
21. Loudness of sound (53). Winkelmann, Akustik, S. 228-254. A.
G. Webster, Physical Review, 16, 248 (1903) ; Proc. Natl. Acad. Sei., 5,
163-199, 275-282 (1919).
22. Acoustic properties of auditoriums (57). W. C. Sabine, Ameri¬
can Architect, 68 (a. series of papers) (1900); Proc. American Acad¬
emy of Arts and Sciences, 42, 51-84 (1906) ; American Architect, 104,
252-279 (1913) ; Collected Papers on Acoustics, Cambridge, 1922.
23. Acoustic properties of auditoriums (58). F. R. Watson, Bul¬
letins, Engineering Experiment Station, University of Illinois: No. 73
(1914), 32 pages; No. 87 (1916), 20 pages; No. 127 (1922), 78 pages;
contain extended bibliographies. Physical Review, 6, 56 (1915).
24. Acoustics properties of auditoriums (58). F. P. Whitman,
Science, 38, 707 (1913); 42, 191-193 (1915). Harry Clark, Science,
50,526 (1919).
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