A hand saw is a multi-use wood shaping tool. It was used on smaller logs for making items such as wooden furniture, rather than larger logs (used to make cabins for example). The saw is not missing a piece at the bottom—that is actually a single handle.
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“Hand Saw,” Cabin Construction at Vance Birthplace, accessed March 23, 2023, https://vbcabinconstruction.omeka.net/items/show/22.