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This is the only semester I spent at Cornell not teaching a local tree climbing course. Regardless, I still found myself substituting for Saturday tree once and staying late. With six physics courses, there just wasn't the time for weekends spring semester junior year.

Besides the substitute gig, I helped rigged the tree-to-tree-to-ground tyro/zip-line for the horticulture students. This is when the attached photos were taken. This endeavor was the most complex rope system I have helped rigged. It involved climbing two trees, and setting up a mechanical advantage system on the ground to pull the slack out. Colin, Tammy, Jake, Joe, and Drew were there to help out. Mark occupied himself training the new tree TA's.

The pulley system I designed worked a little too well, and violated the rule of twelve (only tighten ropes to the pull strength of twelve people). Luckily, nothing in the system exploded, and we were able to loosen the z-drag with the friction hitch at one end. After taking apart the system we found that the bearings in one of the pulleys in the tightening system began to press through the aluminum pulley wheel, ruining the device. The excess potential energy we stored in the rope could have released itself by snapping the z-drag, which we were standing next to. Luckily it didn't, and we all learned our lesson.

Also, who put Mark's desk chair in a tree?