DescriptionClockMainspring.png Drawing of a clockmainspring from the mid 19th century. WARNING - Never disassemble a watch or clock that contains a mainspring
107 475 479 English: Stackfreed arm 177 94 52 57 475 479 English: The mainspring arbor. The watch is wound up by fitting a square key to this shaft and
DescriptionClock, Otto's Encyclopedia-1.png Français : Détail d'un mécanisme d'horloge à ressort moteur Date 4 March 2017 Source "Hodiny." Ottův Slovník
DescriptionGoing barrel.png Drawing of a 'going barrel' type mainspring barrel in a watch, sectioned through the axis. The mainspring is shown fully wound