This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Stackfreed. Drawing of early th century pocketwatch movement with stackfreed mainspring compensating device The stackfreed is the eccentric cam near the top engaged by the long springloaded roller arm It's purpose was to compensate for the decline of the mainspring's force as it unwound Early in the watch's running period when the