Machinery and processes of the industrial arts, and apparatus of the exact sciences (1869)
Barnard, Frederick A. P. (Frederick Augustus Porter), 1809-1889 · Washington, Govt. print. off. · leaf 493
Tillmans Tonometer furnishesa simple elucidation, which, by directly addressing itself to the eye, con-veys the truths to be illustrated more directly and more clearly than 476 PARIS UNIVERSAL EXPOSITION. pages of numerical statements can do. A circle represents the octave,(the septate Prof.… … Tillmans Tonometer Dial. each containing five artificial commas, making sixty in all. Seven whiteescutcheons mark the places of the notes of the natural diatonic scale;and five black escutcheons indicate the interpolated semitones. Twocircular musical staves connecting these escutcheons show the…
Machinery · Scientific apparatus and instruments
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