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References

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  1. Hornborstel and Wertheimer—Sitz. Königlich Preuss. Akad. der Wissen. p. 388; 1920.

1920 (1)

Hornborstel and Wertheimer—Sitz. Königlich Preuss. Akad. der Wissen. p. 388; 1920.

Hornborstel,

Hornborstel and Wertheimer—Sitz. Königlich Preuss. Akad. der Wissen. p. 388; 1920.

Wertheimer—Sitz,

Hornborstel and Wertheimer—Sitz. Königlich Preuss. Akad. der Wissen. p. 388; 1920.

Königlich Preuss. Akad. der Wissen (1)

Hornborstel and Wertheimer—Sitz. Königlich Preuss. Akad. der Wissen. p. 388; 1920.

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Figures (4)

Fig. 1
Fig. 1

Wiring diagram of the pulse-producing apparatus.

Fig. 2
Fig. 2

Typical curve showing decrease in accuracy with decrease in time interval.

Fig. 3
Fig. 3

Effect of fatigue on the observer.

Fig. 4
Fig. 4

An outstanding record.