SIMPLE MOTOR-DRIVEN DEVICES FOR FEEDING AND WATERING ANIMALS.

The authors built two small machines. One drops food pellets. One gives water drops.

Both run on a timer. A motor turns a wheel. The wheel opens a gate for one second.

They used cheap parts. A clock motor, plastic wheel, and metal gate. You can build it in an afternoon.

The paper shows how to build the devices. It does not test animals.

The authors say the feeders ran for months without jamming. They claim timing stayed exact to the second.

Schwartz et al. (1971) took this feeder and added a lever. Rats learned to press the lever ten times for one pellet. The 1964 device became a teaching tool.

James et al. (1981) used the same idea with children. Instead of food, a light flashed when kids spoke louder. The 1964 motor idea moved from lab rats to preschoolers.

Azrin et al. (1967) built a shock chamber the same year. Both papers give exact plans. One feeds. One shocks. Same goal: clean, automatic control.

You can still build this feeder today. It costs less than twenty dollars. Use it to run overnight sessions. Or pair it with a button to teach new skills. The plans are free and tested.