THE ANCIENT MODE OF ORGAN BLOWING. FROM PRAETORIUS' THEATRUM INSTRUMENTORUM. 1620.

TERRA-COTTA MODEL OF HYDRAULIC ORGAN. CIR. 150 A.D. CARTHAGE MUSEUM. FROM HERMANN SMITH'S The Making of Sound in the Organ and in the Orchestra.

REV. F. W. GALPIN'S WORKING REPRODUCTION OF THE ROMAN HYDRAULUS. FROM HERMANN SMITH'S The Making of Sound in the Organ and in the Orchestra.