Gravity Bar
thingiverse
This is a basic testing system (largely made from 3D printed parts) based on a design by John Walker (http://www.fourmilab.ch/gravitation/foobar/). Gravity is a relatively weak force of attraction between two objects, beyond which things become increasingly speculative. This "gravity bar" is a rod with lead weights attached to each end. It hangs from a ladder using 6-pound test fishing line. A flat plate at the bottom of the rod sits in water to reduce rotation. On August 12, I added a longer bar (longer bar, extenders and sphere holder)
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