Two Cycle Engine
(Really a Two Stroke Engine)
Clear Plastic Overhead Projection Demonstrator
3M Visual Products Catalog # 1040

The box shows a lot of wear Crank at BDC Crank at TDC
(Each picture above links to a larger image)

Here's a neat overhead projector gimmick which demonstrates the basic movement of a two stroke engine. The plastic unit is in mint or maybe even perfect condition. The box shows lots of shelf wear and even a split corner on the cover.

The flywheel of the crankshaft has a little knob so you can manually turn the crank and the connecting rod moves the piston up and down.

While wiping the dust off this gem, I realized the piston was flipped upside down. I fixed it, but didn't reshoot the pictures. When you look at the pictures, please flip the piston over mentally, then you can visualize it correctly. There's not a whole lot to say about something so self-evident. Take it away, please!

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