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A clockwork mechanism usually has a clockwork motor. This has a mainspring, a spiral of metal ribbon. Energy is stored in the mainspring by winding it up, turning a key attached to a ratchet which twists the mainspring tighter. Then the force of the mainspring turns the clockwork gears, until the stored energy is used up. The adjectives wind-up and spring-powered refer to mainspring-powered clockwork devices. These include clocks and watches, kitchen timers, music boxes, and wind-up toys.
- "Clockwork - Definition of clockwork by Merriam-Webster". merriam-webster.com. http://www.merriam-webster.com/dictionary/clockwork.
- "Clockwork - define clockwork at Dictionary.com". Dictionary.com. http://dictionary.reference.com/browse/clockwork.
- Whitney William Dwight (ed) (1914). The Century Dictionary and Cyclopedia, Vol. 2. New York: The Century Co.. https://books.google.com/books?id=d0dFAQAAMAAJ&pg=PA1447&dq=clockwork.
- Chambers Concise Dictionary. Allied Publishers. 2004. pp. 227. . https://books.google.com/books?id=iwWuY9tAVq8C&pg=PA227.
- The talking machine encyclopædia: a comprehensive and descriptive glossary of all terms used in connection with the talking machine. London: Phono Trader Printing and Publishing. 1908. pp. 45–47. https://books.google.com/books?id=TSEyAQAAMAAJ&pg=PA45&dq=%22clockwork+motor%22. , description of the clockwork motor in an antique phonograph