Bauhaus-Universität Weimar

Titel:
A descriptive list of anthropometric apparatus, consisting of instruments for measuring and testing the chief physical characteristics of the human body. Designed under the direction of Mr. Francis Galton
Person:
The Cambridge Scientific Instrument Company
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit38593/8/
9 
high musical note best described as a very shrill squeak and the noise made by the 
air leaving the mouth of the whistle. To apply the test the whistle is sounded 
and the length shortened until a point is reached when the squeak becomes 
inaudible. With a little practice this can be easily done ; the length of the whistle 
is then measured by inserting a wedge-shaped ivory scale between a flange fixed 
to the plug itself and a flange on the whistle : the numbers engraved on the scale 
giving the length of the whistle in millimetres. The following table gives the 
number of vibrations per second of a column of air of different lengths, at a 
temperature of 15° C. 
Length of Column of air 
Number of complete 
Number of complete 
in millimetres. 
vibrations per second 
vibrations per second 
by calculation. 
by experiment. 
10 
85,000 
1-2 
70,830 
1-4 
60,710 
1-5 
56,670 
1-6 
53,130 
1-8 
47,220 
20 
42,500 
25 
34,000 
3 0 
28,330 
3-5 
24,290 
40 
21,250 
5 0 
17,000 
60 
14,170 
7 0 
12,140 
80 
10,630 
90 
9,440 
100 
8,500 
The numbers in the second column are found by the following formula 
n=no. of vibrations per second. 
» = velocity of sound taken at 340 metres per second. 
X = wave length. 
The figures in the next column will be inserted when the experiments are 
completed. Care is taken to make all the whistles as nearly identical as possible. 
Price complete in pocket case. £15 0 
Reaction time to Sound and Sight. 
This instrument is for measuring the interval of time between a signal and the 
depression of a key by the person observing the signal. The person sits down and 
rests his hand on a slab with his finger on a key. On hearing or seeing the signal, 
as the case may be, he presses the key as quickly as possible. The time is measured 
by the distance through which a rod has fallen and its amount is read off directly 
from graduations on the rod itself in hundredths of a second. To use the 
ST TIBB S BOW, CAMBRIDGE, ENGLAND.
        

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