File:Balance spring types.png

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Summary

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
Permission
(Reusing this file)		 Public domain - Britten died in 1913

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checksum

6d4b3c29b59f29d91fdec265ea1a5ed13359e93f

determination method or standard: SHA-1

data size

27,462 byte

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313 pixel

width

1,540 pixel

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Date/TimeThumbnailDimensionsUserComment
current16:59, 5 December 2007Thumbnail for version as of 16:59, 5 December 20071,540 × 313 (27 KB)wikimediacommons>Chetvorno{{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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