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Appunn's 'treble' Tonometer

1870
Tone limit apparatus for notes of low pitch, C(128) to (8).

Tone limit apparatus for notes of low pitch

1870
Appunn's "tenor" Tonometer containing 65 reeds. C(256) to C"(512)

Appunn's 'tenor' Tonometer

1870
Tube furnace by Heraeus, West Germany

Tube furnace by Heraeus, West Germany

1965-1975
Tone-limit apparatus for notes of high pitch, consisting of 31 small tuning forks on stand. Two violin bows for use with the forks.

Tone-limit Apparatus for Notes of High Pitch

Overtone apparatus with 65 reeds; (one reed broken and one reed bent).

Overtone apparatus with 65 reeds

1870