So I figured I’d post this here. It is a tree bar component which I made in SketchUp last night. It would be used to build half-circular platform bases which could act as mounts to build elevated walkways through trees.The idea is, with enough of these platforms you could start building an actual tree city.

The design uses a mounting bracket (pink) to hold a triangular beam (red) which has a stability extender at the end (orange). Most of the downward force will be applied to the extender rather than the beam. To prevent the three bolts from shearing, there is a tension relieving rod (blue) which is pre-fabricated inside the triangular beam. When the extender is pulled out of place, it takes the rod with it, sending all the tension forces backward into the lower part of the triangular beam.

That’s the theory, anyway. For the record, I am NOT a civil engineer. That said, if a civil engineer wants to test this, I’d love to be a part of something like that!



Blueprint of medieval cathedral

This is cool. The top image shows a drawing on parchment from the 1260s. It is one of the earliest existing architectural drawings and depicts the façade, or front, of Strasbourg Cathedral in France. The “blueprint” almost stands a meter tall. What’s so special about this medieval artifact is that it still exists: single sheets rarely survive from the Middle Ages (with the exception of charters). Equally special is that we can compare the drawing to the real thing (lower pic): it is not hard to recognizes the big round window in both drawing and real building - note also the door underneath it and the pointy window to the right. How great that we are given a peek on the medieval architect’s drawing board. Ironically, he did not live to see his creation built, because the cathedral was finished in the 14th century.

Pic: Musée de l’Oeuvre Notre-Dame, Strasbourg, Inv. no. 2. More about the drawing here. The photograph is from this blog.