Either this was simply the result of the lengths of timbers that could be obtained easily or it was to stagger the position of the mortises in the main beams.
From theCambridge English Corpus
Generally the size of themortiseand tenon is related to the thickness of the timbers.
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Only large, or high-quality work required the square ends and smoothed sides of a precisemortise, trimmed by this variety of chisels.
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It was built about 1920, and is a large, 2 1/2-story,mortise-and-tenon framed mill building, topped by an unusual and picturesque mansard roof.
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The walls are structured with vertical and diagonal hand-hewn timbers also set with peggedmortiseand tenon joinery at the sills and plates.
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For cutting small mortises, a normal drill bit can be used.
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Amortiseor slot is cut vertically in the bedpost.
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Pieces were assembled usingmortise-and-tenon joinery, held together with lashings, pegs, metal nails, and glue.
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There are nomortiseand tenon fastenings, and no sewing.
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It consists of a movable block with one or more dog holes in it, the movable block rides in a largemortisein the workbench.
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It featuresmortiseand tenon jointing, also known as corner-post construction, for the log structure.
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A xed tenon was made by shaping the end of one timber to t into amortise(hole) that is cut into a second timber.
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Early planes were made from wood with a rectangular slot ormortisecut across the center of the body.
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Rather than having its spokes mortised into a wooden nave (hub), it has them fitted together (mitred) then bolted into a metal nave.
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It was built during the spring and summer of 1839 with a hand hewn timber frame ofmortiseand tenon construction.
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