Bauhaus-Universität Weimar

Titel:
Researches in experimental phonetics
Person:
Scripture, Edward Wheeler
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit21940/35/
32 
THE STUDY OF SPEECH CURVES. 
portion off is changed each time to avoid getting the portions reversed. 
The portions are then pasted on pasteboard sheets of the required size. 
For reproduction in the form of plates for printing, the curve has 
to be made somewhat whiter than is otherwise necessary. A small wax 
weight is added to the outer part of the recording point, so that the glass 
knob rests a little more heavily on the smoked paper. The danger lies 
in the bending of the lever due to the greater resistance of the smoke. 
A test of amplitudes is made before and after adding the wax; if the altera¬ 
tion falls within the limit of error (say 1 per cent) the wax is retained. 
The only available processes of reproduction seem to be copper 
etching and zinc etching. The former gives excellent results, but is 
expensive. The latter is successful only when the engraver employs the 
best zinc. The mount is photographed by the engraver. Ordinarily the 
negative is then stripped from the glass; since the gelatine stretches and 
introduces errors, this process is avoided by mounting all the curves back¬ 
wards (from right to left) on the pasteboard and instructing the engraver 
not to strip the glass plate. In the print the curves appear to read from 
left to right. With the usual construction of the apparatus used for 
taking records the phase of condensation of the original sound registers 
with an outward (centrifugal, away from the center) deviation of the 
sound groove. With the tracing point as shown in figure 21 this phase 
gives a deviation upward on the page. The curve as seen in the figure 
reads backward. When the strips are mounted backward, the blocks 
produced from them without stripping have the phase of condensation 
also upward. 
Illustrations of the work done by the gramophone tracing apparatus 
are given in the accompanying figures and plates. The time equation 
for figures 28 to 40 is 1mm. = 0.0004s. The curves in figures 28 and 29 
were made by the apparatus with single lever as shown in figure 18; 
the pressure of the glass point against the paper was very light 
and the line—reproduced by zinc etching without retouching—appears 
like a series of dots. For the curve in figure 30 the glass point was 
weighted and the zinc etching—with no retouching—appears clearer. 
The curve in figure 31 was produced in the same way, but was retouched; 
the line is stronger, but is at a decided disadvantage on account of its 
raggedness and also because its width renders it difficult to measure. 
The curve for the yodel (figure 28) is a short portion out of a single note; it 
shows strong, smooth waves, each of which corresponds to one vibration of 
the voice. The short portion in figure 29 shows a softer yodel combined 
with piano vibrations. The trombone vibrations (figure 30) show consider¬ 
able fluctuations in intensity even in the short time represented by the piece
        

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