American system of watch manufacturing
|This section requires expansion with: anything other than 19th century. (January 2011)|
The American System of Watch Manufacturing began in the mid-19th century when Aaron Lufkin Dennison became inspired by the manufacturing techniques of the United States Armory at Springfield, Mass. These manufacturing techniques, known as the "armory practice", or the "American System of Manufacturing" were based on a strict system of organization, the extensive use of the machine shop, and control systems utilizing gauges. Aaron Dennison proposed using these techniques to manufacture watches, and in 1850 along with others, founded the Waltham Watch Company.
Manici Kirko Bangz
Waltham Watch Company
The chronology of production phases at the Waltham Watch Company can be divided into three sections:
- 1849-1857 Learning and Experimenting
- 1858-1870 Refining and Gauging
- 1871-1910 Automating and Factory Organization
The application of armory practices to the manufacture of its watches provided both an opportunity, and a risk to the Waltham Watch Company. In terms of opportunity, the high price of watches allowed for a large investment in research and development, which was aimed toward the reduction of labor costs. At the time, the major factor behind watch prices was the cost of labor, so any system that significantly reduced labor costs would provide a substantial increase in profits. Unfortunately, the goal of labor reduction proved elusive. In 1910, after 40 years of manufacturing improvements, labor still accounted for 80% of the cost of watches based on data from the Elgin National Watch Company.
Since watches require very strict production tolerances, and very few manufacturing defects, it is hard to reduce labor costs. Other products made via armory practices, such as firearms, and sewing machines have tolerance levels 10 to 100 times greater than those necessary for watch making. A watch gear that is offset by a few thousands of an inch will cause increased friction, which will reduce critical power needed for the balance wheel, and hence increase the wear of the watch. Before the armory practices were applied, watch manufacturing techniques required expert watchmakers to recognize slight variations in part sizes in order to place each gear in the correct location, and to make other highly specialized adjustments during the manufacture of each watch.
The Beginning of Standardized Production
Henry and James F. Pitkin were employed in the manufacture of jewelry in Hartford, Connecticut in the mid-1830s. Their business failed as a result of the panic of 1837. The Pitkin brothers then turned their attention to the manufacture of watches. The brothers were able to construct rather crude machinery for the production of watches, particularly for the manufacture of pallets. The first movement was completed in 1838, and Crossman reports that between 800 and 900 watches in total were completed through 1845. Surviving examples of Pitkin watches show that the parts are, in fact, interchangeable. This is contrary to what is reported by Crossman.
A few years later, a reputable clockmaker by the name of Edward Howard and the watch repairman, Aaron L. Dennison, formed plans to construct a watch with interchangeable parts based on Dennison's visit to the Springfield armory. The pair constructed a factory in Roxbury, with financial backing provided by Samuel Curtis and D.P. Davis (a partner of Howard in his clock business). This company initially operated under the name of the American Horologe Company, but was quickly changed to the Warren Manufacturing Company to hide the purpose from foreign suppliers. The initial focus was on the production of an 8 day watch; however, this proved to be too expensive and not very accurate. Instead, the attention was turned to a 30 hour watch designed very similarly to what ultimately became the standard for an American 18 size watch. The first of these carried the serial number of 18, and was marked "Warren." This was completed in 1852. Approximately 80, "Warren" watches were produced, followed by about 900 marked, "Samuel Curtis" and a further 4000 marked, "Dennison, Howard, and Davis". The factory was moved to Waltham around 1857. The basic design of this watch was used for several years as the 1857 model Waltham.
In order to achieve these strict tolerances; watch manufacturers largely manufactured their own machine tools and machine parts. Elgin manufactured almost two drill bits for each watch it manufactured. The knowledge of how to manufacture machines that could manufacture watches spread: from Waltham to Elgin and then to dozens of other American watch companies and manufacturers of other products. Techniques such as jigs, stops, and measuring devices on machines were not just refined, but other techniques were also developed; for example, statistical methods were used to reduce waste. If a gear staff (axle) and a jewel bearing hole were designed to be a given size, then the parts that most closely met those design goals were used in the highest grade watches, while staffs that were too large would be matched to watch jewels with holes that were too large. Together they could be used on lower grade watches.
- Hounshell, David A. (1984), From the American System to Mass Production, 1800-1932: The Development of Manufacturing Technology in the United States, Baltimore, Maryland: Johns Hopkins University Press, ISBN 978-0-8018-2975-8, LCCN 83016269
- Priestley, Philip: Aaron Lufkin Dennison, an industrial pioneer and his legacy, NAWCC, 2010.
- Crossman, Charles S. Compiled by Dawes, Donald A Complete History of Watch and Clockmaking in America (The Jewelers Circular and Horological Review)
- Hoke, Donald Robert The Time Museum Historical Catalogue of American Pocket Watches (Time Museum Rockford, Illinois, U.S.A.)
- Hounshell, David A. From the American System to Mass Production, 1800-1932: The Development of Manufacturing Technology in the United States (Baltimore, Maryland: Johns Hopkins University Press) ISBN 978-0-8018-2975-8
- Carosso, Vincent P., The Waltham Watch Company: A Case History, Bulletin of the Business Historical Society, Vol. 23, No. 4 (Dec., 1949), pp. 165–187, published by The President and Fellows of Harvard College
- Engle, Tom; Richard E. Gilbert; and Cooksey Shugart, Complete Guide to Watches, Twenty Seventh Edition, January 2007, ISBN 1-57432-553-1
- Edward A. Marsh (1896), The evolution of automatic machinery as applied to the manufacture of watches at Waltham, Mass., by the American Waltham Watch Co., Chicago: G. K. Hazlitt & co.
- Sandburg, Carl, Lincoln Collector: The Story of Oliver R. Barrett's Great Private Collection, Harcourt, Brace and Company, 1949
- Shugart, Cooksey, The Complete Guide to American Pocket Watches, 1981, ISBN 0-517-54378-8