A stackfreed is a simple spring-loaded cam mechanism used in some of the earliest antique spring-driven clocks and watches to even out the force of the mainspring, to improve timekeeping accuracy.[1][2][3] Stackfreeds were used in some German clocks and watches from the 16th to the 17th century,[4] before they were replaced in later timepieces by the fusee. The term may have come from a compound of the German words starke ("strong") and feder ("spring").[5][6]
- ^ "Stackfreed". The Merriam-Webster dictionary online. Merriam-Webster. 2012. Retrieved May 27, 2012.
- ^ Christianson, David (2002). Timepieces: Masterpieces of Chronometry. David & Charles. p. 36. ISBN 0715315412.
- ^ White, Lynn Jr. (1962). Medieval Technology and Social Change. UK: Oxford Univ. Press. pp. 127–128.
- ^ Daniels, George (2011). Watchmaking. UK: Phillip Wilson. p. 259. ISBN 978-0856677045.
- ^ "Stackfreed". Dictionnaire de l'horlogerie. WorldTempus French watch website. 2012. Archived from the original on 2013-02-10. Retrieved May 27, 2012.
- ^ xwatchmaker (July 21, 2008). "Mechanical Watches". Newsgroup: Blogspot. Retrieved May 27, 2012.
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