Inshave

Inshaves are used for saddling Windsor chair seats
after rough shaping the contour with a hollowing adze. This inshave has a curved blade that is slightly flattened in the center area, with steeper curves at the sides. (It does not have a uniform radius, which tends to leave scooped tracks on the bottom of a chair seat.) The flatter section is used in the less dished center of a chair seat; the upswept sides are used towards the back of the seat, just below the flat spindle section. The handle tangs are angled upwards just enough to keep your knuckles above the surface being carved, but also rather low for efficient cutting.
This tool can also successfully be used for other carving projects.