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Clocks: a repeater clock mechanism, exploded view. Engraving by Prevost after G. d'Heuland.

Clocks: various springs, escapements, and correction mechanisms. Coloured engraving by J. Pass, 1809.

Clocks: spring driven clock mechanism. Engraving by Prevost after G. d'Heuland.

Clocks: a device for balancing cogs. Engraving by Prevost after Bourgeois.

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Balance springs

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Clocks: spring driven clock mechanism. Engraving by Prevost after G. d'Heuland.

Clocks: a device for balancing cogs. Engraving by Prevost after Bourgeois.

Clocks: a repeater clock mechanism, exploded view. Engraving by Prevost after G. d'Heuland.

Clocks: a device for balancing cogs. Engraving by Prevost after Bourgeois.

Clocks: various springs, escapements, and correction mechanisms. Coloured engraving by J. Pass, 1809.