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N38 27.ABC W121 28.DEF
A= A pipe organ with "great leaden pipes" was sent to the West by the Byzantine emperor Constantine V as a gift to Pepin the Short, King of the Franks, in 75A
B= Until the mid-15th century, organs had no stop controls. Each manual controlled ranks at many pitches, known as the "Blockwerk." Around 1B50, controls were designed that allowed the ranks of the Blockwerk to be played individually.
C= Some 40C pieces of a hydraulis from the year 228 AD were revealed during the 1931 archaeological excavations in the former Roman town Aquincum, province of Pannonia (present day Budapest), which was used as a music instrument by the Aquincum fire dormitory; a modern replica produces an enjoyable sound.
D= Organ builders began to lean towards specifications with fewer mixtures and high-pitched stops. They preferred to use more 8′ and 1D′ stops in their specifications and wider pipe scales.
E= Starting in the 1E60s bellows were gradually replaced by rotating turbines which were later directly connected to electrical motors.
F= Such a rank is said to be unified or borrowed. For example, an 8′ Diapason rank may also be made available as a F′ Octave.