Aristide Cavaillé-Coll was born at Montpellier, France, on the 4th day of February, 1811. He was the son of Dominique Cavaillé-Coll, who was well known as an organ-builder in Languedoc, and grandson of Jean Pierre Cavaillé, the builder of the organs of Saint Catherine and Merci of Barcelona. The name of Coll was that of his grandmother. If we should go back further we find at the commencement of the Eighteenth Century at Gaillac three brothers--Cavaillé-Gabriel, the father of Jean Pierre; Pierre, and Joseph, who also was an organ-builder. Aristide Cavaillé, therefore, came honestly by his profession and at the age of 18 years was entrusted by his father to direct the construction of the organ at Lerida, in which he introduced for the first time the manual to pedal coupler and the system of counter-balances in the large wind reservoirs.
In 1834 Aristide, realizing the necessity of cultivating his knowledge of physics and mechanics, went to Paris, where he became the pupil of Savart and of Cagnard-Latour. The same year a competition was opened for the construction of a large organ in the royal church of St. Denis; Aristide submitted his plan and succeeded in obtaining the contract. This success decided the Messrs. Cavaillé to remove their organ factory to Paris, where they established themselves in the Rue Neuve St. George. On account of repairs being made to the church building, the organ of St. Denis was not finished until 1841, but it showed improvements of great importance, first and foremost of which was the Barker pneumatic lever (see _ante_, page 120). The wind pressure was on a new system, whereby increased pressure was applied to the upper notes, giving more regularity of tone to each stop. The wind reservoirs were provided with double valves, insuring a more steady supply, whether all the stops were played together or separately. The introduction of Harmonic stops was practically an innovation, as their use hitherto had been almost prohibited by the difficulty of playing on a high wind pressure (see _ante_, page 21). This enriched the organ with a new group of stops of a superior quality on account of the roundness and volume of sound.
In 1840 Cavaillé-Coll submitted to the Académie des Sciences the result of his experimental studies of organ pipes; on the normal tone of the organ and its architecture; the length of pipes in regard to intonation and precision in blowing. He made many experiments and improvements in wind supply. He was also the inventor of "Poikilorgue," an expressive organ, which was the origin of the harmonium.