Dr. Hinton does not credit the story that Barker, accidentally witnessing the operations of an eminent organ-builder (Bishop, of London) who was erecting an organ in his neighborhood, determined on following that occupation, and placed himself under that builder for instruction in the art. It seems to be admitted, however, that after spending most of the intervening time in London, he returned to Bath two years afterwards and established himself as an organ-builder there.
About 1832 the newly built large organ in York Minster attracted general attention, and Barker, impressed by the immense labor occasioned to the player by the extreme hardness of touch of the keys, turned his thoughts toward devising some means of overcoming the resistance offered by the keys to the fingers. The result was the invention of the pneumatic lever by which ingenious contrivance the pressure of the wind which occasioned the resistance to the touch was skilfully applied to lessen it. He wrote to Dr. Camidge, then the organist of the Cathedral, begging to be allowed to attach one of his levers in a temporary way to one of the heaviest notes of his organ. Dr. Camidge admitted that the touch of his instrument was "sufficient to paralyze the efforts of most men," but financial difficulties stood in the way of the remedy being applied. Barker offered his invention to several English organ-builders, but finding them indisposed to adopt it, he went to Paris, in 1837, where he arrived about the time that Cavaillé-Coll was building a large organ for the Church of St. Denis. M. Cavaillé-Coll had adopted the practice of making his flue and reed pipes produce harmonic tones by means of wind of heavy pressure; but he encountered difficulty as the touch became too heavy for practical use. Mr. Barker's apparatus, which simply overpowered the resistance that could not be removed, was therefore an opportune presentation; he took out a brevet d' invention for it in 1839, and M. Cavaillé-Coll immediately introduced it, together with several harmonic stops, into the St. Denis organ. Besides the organ of St. Denis, Barker's pneumatic lever was applied to those of St. Roch, La Madeleine, and other churches in Paris.
"Barker's connection with Cavaillé was not of long duration, and we next find him in the Daublaine & Callinet organ-building company. At this time the company was rebuilding the magnificent organ at St. Sulpice, the acknowledged masterpiece of Cliquot, the French 'Father Schmidt.' * * *
"During the time this restoration of the organ was in hand, Louis Callinet experienced acute financial difficulties, and, failing to induce Daublaine, his partner, to advance him a relatively small sum, * * * Callinet became so bitterly incensed that one day, going to the organ on some trifling pretext, he entirely wrecked it with axe and handsaw.
"This act of vengeance or criminal folly involved Daublaine in the same financial ruin as himself, and through this tragic occurrence the firm in which Barker was beginning to be securely established came to an end. Callinet, being absolutely penniless, was not prosecuted, but ended his days in the employ of Cavaillé as voicer and tuner.
"Nor was this the only disaster which occurred during the time Barker was with Daublaine & Callinet. In 1844 (December 16th), it was Barker's ill-fortune to kick over a lighted candle while trying to remove a cipher in the organ his firm had recently erected in St. Eustache, which occasioned the total destruction of the organ. * * *
"The outlook seemed unpromising for Barker when the firm of Daublaine & Callinet came to an end. The good will of that concern was, however, purchased by M. Ducroquet (a capitalist), who entrusted him with its management.
"J. B. Stoltz, Daublaine & Callinet's foreman, a very able man and a splendid workman, feeling aggrieved at Barker's promotion, seceded and set up for himself, his place in the new firm being filled by M. Verschneider, in whom Barker found efficient support in matters of technical knowledge and skill.
"During the time Barker was with M. Ducroquet the present organ at St. Eustache was built, to replace that so unfortunately destroyed by fire; also an organ which was exhibited at the great exhibition of London in 1851. * * *
"In the Paris exhibition of 1855 Barker was admitted as an exhibitor, independently of M. Ducroquet (who was in bad health and on the eve of retiring from business), obtaining a first-class medal and nomination as Chevalier of the Legion of Honor.