A closer look for those of you who like these sorts of things....
Two-cylinder, air-cooled, horizontally-opposed, 4-stroke engine (very appropriate for a Lycoming engineer). It has the number '1926' stamped on the block up near the crankcase vent. Not sure if it is a serial number or a date or a part number (I'd like to think it's a date)
Check out the exposed valvetrain, the tiny updraft carb and the magneto ignition. Those are big displacement cylinders-not sure exactly how big but the cylinders on this engine blow away the jugs on our Lycoming engines which are on the order of +5" bore and +4" stroke. Its a pretty low compression engine and it has to be. It's started with the hand crank on the front.
And the legendary "friction-drive" transmission.
This system allows for variable drive ratios in both the forward and reverse directions and clutch action too. The flywheel on the right is attached directly to the engine crankshaft. The spoked wheel can be slid back and forth along the square shaft. The square shaft is connected to the rear axle via a chain/sprocket set.
The operator slides the spoked wheel to one side or the other of the flywheel nut and this determines the direction-the engine always spins the flywheel the same way (counter-clockwise from this viewpoint). With the spoked wheel in the position in the picture, the car will move forward. If it is slid towards our viewpoint, past the flywheel nut, the car will move backwards. For clutch action, the lever, visible behind the spoked wheel, is moved rearward by the operator, which pushes the square shaft towards the flywheel. Friction between the spoked wheel and the flywheel then causes the power from the engine flywheel to move through the spoked wheel, the square shaft and the sprocket/chain set, to the rear axle.
Consider yourselves educated.