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| Keywords: Balance spring types.png 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 downloaded from http //books google com/books id 1SgJAAAAIAAJ pg PA6 Britten Frederick J 1898 On the Springing and Adjusting of Watches Spon Chamberlain p 6-7 figs 2 3 4 and http //books google com/books id 7DcDAAAAQAAJ pg PA187 Nelthropp Harry L 1873 A Treatise on Watch-work Past and Present E F N Spon London p 187 fig 19 on Google Books and 1873 1898 Frederick J Britten and Harry L Nelthropp Public domain - Britten died in 1913 PD-old Balance springs Old horology prints | ||||
