File:Balance spring types.png

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Description
English: Drawings of different types of watch and chronometer balance springs. Types: (1) flat spiral, including central collet and end stud, (2) Breguet overcoil, (3) chronometer helix, with axial view showing Breguet end curves, (4) early forms. The early springs are from Nelthropp, others are from Britten. Alterations: combined source images into a composite, removed captions and part labels, scaled and rotated Nelthropp image to match others, added new labels in color, converted to PNG.
Date and 1898
Source downloaded from Britten, Frederick J. (1898) On the Springing and Adjusting of Watches, Spon & Chamberlain, p.6-7, figs.2,3,4 and Nelthropp, Harry L.(1873) A Treatise on Watch-work, Past and Present, E.& F.N. Spon, London, p.187, fig.19 on Google Books
Author Frederick J. Britten and Harry L. Nelthropp
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(Reusing this file)		 Public domain - Britten died in 1913

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current15:59, 5 December 2007Thumbnail for version as of 15:59, 5 December 20071,540 × 313 (27 KB)Chetvorno (talk | contribs){{Information |Description=Drawings of different types of watch and clock balance springs. Types: (1)flat spiral, with central collet and end stud, (2)Breguet overcoil, (3)chronometer helix, with axial view showing Breguet end curves, (4)early forms. Th

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