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.
1783 St Jacobi, Hamburg, "Tertia minore" stop..1688-1693Hofcapelle, Dresden.
Jacobi and that of three squares by F.
von Jacobi showed that for a given electromotive force in the battery the horse-power is greatest when the current is reduced to one-half of what it would be if the engine were at rest.
Jacobi in 1857.