Sir Frederick Gore Ouseley (vide Ellis's lecture) regarded the French ton de chapelle as being about a minor third below the Diapason Normal, a' 435, and said that most of the untouched organs in the French cathedrals were at this low pitch.
This is about a semitone below the Diapason Normal, and a just minor third lower than the St Jacobi organ in the same city (1688), measured by Herr Schmahl, a' 489.2.
But the Philharmonic Society adopted the Diapason Normal in 1896, and the military bands have not gone with it.
Other countries have gradually followed, and, with few exceptions, the low pitch derived from the Diapason Normal may be said to prevail throughout the musical world.
The French Commission, in establishing the Diapason Normal, should have chosen a temperature of 20° C.
1826 Paris Diapason Normal.
1834 Paris Diapason Normal.
But Zarlino uncompromisingly declared that the syntonous or intense diatonic scale was the only form that could reasonably be sung; and in proof of its perfection he exhibited the exact arrangement of its various diatonic intervals, to the fifth inclusive, in every part of the diapason or octave.
(Since 1886 the Society of Arts has advo cated the Diapason Normal)1860 Authority.