Count the Pegs

Can you spot the peg difference? This is a picture looking down through the staircase running up through Jack Morway's four-story apartment building. The building is relatively tall and narrow, with the lateral bracing system and connections working pretty hard. The lateral forces get larger, the nearer to the ground they are. You can see the horizontal splines that resist the tension generated in the heavy braces that stiffen this building laterally. If you look at the splines toward the top, there are only three pegs. The same splines, lower down the staircase have four pegs and six pegs at the first floor. This is a unusually clear instance of joinery details reflecting the applied loads; and for this, I admire it.

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