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Driesen, Otto. 1913. Das Grammophon Im Dienste Des Unterrichts Und Der Wissenschaft. Band I, Teil 1: Kindergarten, Volksschule, Mittelschule, Höhere Lehranstalten. Berlin: Deutsche Grammophon-Aktiengesellschaft.
Audio
2013. “24576_1876-469_Tone-Limit-App_1”.
Object, Instrument, Technology

Tone-limit apparatus, for high notes of high pitch.

Made by G. Appunn & Sons.

 

            This apparatus was designed for determining the highest vibration-frequency which is recognized by the ear as a musical tone. It consists of 31 small tuning forks, giving the diatonic scale

Audio
Kolkowski, Aleksander. 2013. “2048 Vps_1876-469_Tone-Limit-Apparatus_1”.
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2013. “2304 Vps_1876-469_Tone-Limit-Apparatus_1”.
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2013. “2560_1876-469_Tone-Limit-App_1”.
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2013. “2730,66_1876-469_Tone-Limit-App_1”.
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2013. “3072_1876-469_Tone-Limit-App_1”.
Audio
“3418,33_1876-469_Tone-Limit-App_1”. 2013.
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Anonymous,. 1961. “Gedruckte Schaltungen Für Neuartige Fernhörer Und Zur Steuerung Von Erdsatelliten”. Die Umschau In Wissenschaft Und Technik.