Bauhaus-Universität Weimar

Experimental Psychology: A Manual of Laboratory Practice, Vol. II: Quantitative Experiments, part 1: Student's Manual
Titchener, Edward B.
Preliminary Experiments 
§ 8. The Qualitative RL for Tones: the Lowest Audible Tone.— 
The object of this experiment is, on the quantitative side, pre¬ 
cisely to determine the lower limit of tonal hearing and, on the 
qualitative, to gain introspective familiarity with the lowest au¬ 
dible tones. 
Fig. 2. 
as favourable as 
the edge of the 
Materials.—Appunn’s lamella. Scraps of 
felt or baize. [The Appunn lamella (Fig. 2) 
is a blade or strip of soft steel, 385 mm. long, 
15 mm. wide, and 1 mm. thick. It is clamped 
in a wooden vise, which is in turn to be screwed 
to the edge of a table. Along one face is 
marked a scale, which shows the point at 
which the strip must be fixed in the vise if it is 
to make 4, 5, 6, . . . . 24 pendular vibrations 
in the 1 sec. The upper end of the lamella is 
riveted to a thin steel disc, about 40 mm. in 
diameter. A cloth ring, 35 mm. in breadth, 
slides up and down the strip : the purpose of 
this ring is to eliminate possible overtones, and 
it is best set, in every experiment, at about one- 
third of the distance from the upper end of 
the strip to the scale mark at which it is 
Adjustment of Apparatus.—The deepest 
tones are intrinsically weak ; and an unprac¬ 
tised 0 finds it difficult to distinguish them 
from noise. Every precaution should therefore 
be taken to make the conditions of observation 
possible. The vise must be clamped firmly to 
table : scraps of felt may be used to prevent 


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