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Bow Woods

A shows billet ready for cutting down to bow form. 1 shows heart-wood, the source of power. 2 shows sap-wood, the bow's protection against breakage. 3 is the bark.
B is a cross-section (at about the handle) after cutting down, leaving sap-wood about ¼ inch thick at center, and heart-wood more or less thick according to power desired.