Watching other Rube Goldberg machines I learned some new techniques which I practiced today. At the start of one film a bin-bag is suspended from strings, and as the strings unraveled the bag span around and gradually got lower, eventually knocking a tyre. Today I applied this principal with one of my glass jars and it worked, but a heavier object will be needed to knock anything else.
When I attached strings to another pill tray, I noticed that when I pulled them the tray would curl up and could spring back open with some force. I applied this idea by pinning down the strings and, when released, using the force to knock a jar along the table. I also rigged up a hanging jar that could be used to knock over another component of the machine.
Another of my ideas was to make a suspended weight travel along a rail. I rigged it up using jar, hanging from the plastic pulley-like object I made before, and a broom handle. It wasn't very successful as the improvised materials didn't fit neatly enough, but when I get some materials I can manufacture some runners which will let the device slide smoothly.
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