Dr Ellis had pipes (now preserved in the Royal Institution, London) made to reproduce both these pitches at 31 in.
(as are all pitches in this article), is a' 393.2.
Sir Frederick Gore Ouseley's comparison of the church and chamber pitches of Orlando Gibbons (vide Ellis's lecture) clearly shows the minor third in Great Britain in the first half of the 17th century.
Scheibler, by his simple and accurate tonometer, has recorded pitches in Vienna about 1834 from a1 433.9 to 440.2.
Table III., showing orchestral pitches obtained in 1899, for the measurements of which the writer is responsible, prove how chimerical it is to hope for greater accuracy than is found between 435 and 440 vibrations a second for a', inasmuch as temperature must always be reckoned with.
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