now with all the mortises cut, it's time to plane the relief bevel and then make the tapered splines. no more video 'til i actually stretch the canvas on, but here's an interesting scan i call 'pine plane shavings'. to the trained eye these shavings reveal either a novice worker doing who-knows-what, or a purposeful worker planing a bevel on the face of a board.
note: pine is the preferred wood for stretcher frames as the resins are compatible with oil paints, it is relatively light for its strength, and it has a closed grain. or such a matter.

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semantics is not always just pedantic quibbling. ~ douglas r. hofstadter