(Regarding the machinery, Dennison later admitted he had no ability as a machinist. However, the watch (which ran eight days and had a single mainspring barrel) did not keep time accurately enough to be used and the machinery was a failure. On his return, he designed and built machinery and made a model of the first watch to be made. Dennison was the only person with knowledge of watchmaking.ДЄ new building was erected adjacent to the Howard & Davis factory in Roxbury, Massachusetts, for the firm Dennison, Howard & Davis.Дennison went to England to buy parts which could not be manufactured in America, to hire journeymen watchmakers to make the watches, and to learn the art of gilding brass watch plates. Howard agreed to the proposal and, with capital from Howard & Davis and HowardвЂ™s father-in-law Samuel Curtis, they started in 1850. In 1849, Dennison approached Edward Howard, partner in the company Howard & Davis, with his plan to manufacture watches. By around 1845, Dennison had decided to adopt the use of interchangeable parts, rather than crafting every watch by hand. After several years of thought, he conceived a plan to do so, even making a scale model.

Dennison, Howard & Davis, and the Boston Watch Company ДЄbout 1840, while Dennison was repairing watches, he began to wonder about manufacturing watches. Under the supervision of Eliphalet Dennison, the company developed into the Dennison Manufacturing Company, which existed until 1990 when it merged and became the Avery Dennison Corporation with headquarters in Pasadena, California. This business was a success, but Aaron withdrew from it because of his increasing interest in the possibility of manufacturing watches. The third venture instigated by Aaron was to manufacture paper boxes for the jewelry business. Together they set up a jewelry store, but it was a failure. Paper box manufacture Дuring the 1830s, Aaron Dennison assisted his younger brother Eliphalet Whorf Dennison to set up in business. They had five children: Charlotte Elizabeth (1842), Alice (1845), Edward Boardman (1847), Ethie Gilbert 1850 and Franklin (1854). In 1840, Aaron married Charlotte Ware Foster (b 1811, d 1901) of Massachusetts.

During this time he created the Dennison Combined Gauge for measuring mainsprings and other watch parts. Dennison then returned to Boston and set up a business selling watches, tools and materials and doing repair work. 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. Here he learned the methods used by English and Swiss watchmakers. 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. He worked for three months without pay at the jewelers Currier & Trott and then stayed another five months on wages. (Automatic watchmaking machinery was not developed until the 1860s and DennisonвЂ™s machine was probably a modification of an ordinary wheel cutting engine).ДЄt 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. 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 вЂњto cut all the wheels of a corresponding size in each at once and in other ways facilitate the workвЂќ. In 1830, at the age of 18, Aaron was apprenticed to a Brunswick clockmaker, James Cary. While there, he suggested the making of shoes in batches rather than one by one. Later he cut and sold wood and then worked for his father in the cobblerвЂ™s shop until the age of 18. As a child, Aaron earned pocket money by carrying a builderвЂ™s hod, working as a herdsman, and as a clerk to a businessman. He was the son of Andrew Dennison, a boot and shoemaker who was also a music teacher. 6 Tracy Baker & Company, and the Tremont Watch CompanyДennison was born in Freeport, Maine, after which the family moved to Brunswick, Maine.5 Dennison, Howard & Davis, and the Boston Watch Company.

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