Bauhaus-Universität Weimar

Experimental Psychology: A Manual of Laboratory Practice, Vol. II: Quantitative Experiments, part 2: Instructor's Manual
Titchener, Edward B.
Pr clim inary Experiments 
Toepler and of Rayleigh (first paper), 189. See also ibid., 3 
Ser., xli., 232 ff. ; and cf. nos. (7) 393, (8) 50, (9) 407. 
(5) M. Wien made an artificial ear-drum by stretching the 
membrane of an aneroid barometer across the mouth of a reso¬ 
nator. The membrane was thrown into vibration by a tuning-fork 
of the same pitch as the resonator (a1 = 440 vs.), actuated by an 
electromagnet and inserted in a telephone circuit. See Ueb. d. 
Messung d. Tonstärke, Diss., 1888; Wied. Ann., xxxvi. 
(cclxxii.), 1889, 835, 838, 849 f. ; and cf. nos. (7) 393, (8) 3, 33, 
46,49, (9) 407. 
(6) Rayleigh, using forks and resonators, determined the 
amplitude of aërial vibration for a liminal tone of c1 = 256 vs. 
See Phil. Mag., 5 Ser., xxxviii., 1894, 370 ; and cf. the writer’s 
earlier paper, Proc. Roy. Soc., xxvi., 1S78, 248; and nos. (4) 
189. (7) 393. 394 (8) 5, 33, (9) 407. 
(7) H. Zwaardemaker and F. II. Quix (Arch. f. Physiol., 
1902, Suppl. Bd., 367 ff. ) determined the RL for a long series of 
tuning forks (392 and Taf. vii.). For comparison of their 
results with those of Rayleigh, Wien and Wead, see 393. 
(8) M. Wien ( Pfl. Arch., xcvii., 1903, 1 ff.) used a series of 
telephone tones: for results, see 32; for critique of no. (7), 48 ff. 
(9) H. Zwaardemaker ( Z., xxxiii., 1904, 407) gives a com¬ 
parative Table of the results of nos. (2), (4 r~(8). Cf. Ann. 
psych., x., 1904. 161 ff. 
We turn now to instruments. ( 1 ) Politzer’s acoumeter con¬ 
sists of a steel cylinder, 28 mm. long and 4.5 mm. in diam., set 
at right angles in a vertical rod of hard rubber which terminates 
above and below in half-rings intended for the reception of thumb 
and forefinger. Just above the cylinder, and parallel with it, is 
a percussion hammer of steel ; the head lies upon the cylinder, 
the handle extends through the hard rubber upright, and the ham¬ 
mer moves about a transverse axis driven through the rod. An 
elbow of hard rubber, carrying a plate of soft rubber or cork, is 
attached to the hard rubber upright just below the handle of the 
hammer. The upright is held between the thumb and forefinger, 
the handle of the hammer pressed down upon the plate bv the 
second finger, and the head then allowed to fall upon the cylinder. 
The height of fall is thus constant ; the tone of the cylinder is a c2.


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