Training in Watchmaking
In 1830, at the age of 18, Aaron was apprenticed to a Brunswick clockmaker, James Cary. During his apprenticeship, he is said to have made an automatic machine for cutting clock wheels, however in his autobiography he merely says he wanted “to cut all the wheels of a corresponding size in each at once and in other ways facilitate the work”. (Automatic watchmaking machinery was not developed until the 1860s and Dennison’s machine was probably a modification of an ordinary wheel cutting engine.)
At age 21, Aaron declined the offer of a partnership with Cary and went to Boston, to work with the most skillful people he could find who were engaged in watch repairing. He worked for three months without pay at the jewelers Currier & Trott and then stayed another five months on wages.
In 1834, he started his own business as a watch repairer, but after two years he gave it up and obtained a position with Jones, Low & Ball and he worked there until 1839 under master watchmaker Tubal Howe. Here he learned the methods used by English and Swiss watchmakers.
In 1839, Dennison moved to New York City where he spent several months with a colony of Swiss watchmakers engaged in various branches of the watch trade. Dennison then returned to Boston and set up a business selling watches, tools and materials and doing repair work. During this time he created the Dennison Combined Gauge for measuring mainsprings and other watch parts.
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