Scientist Alder stops by with an anemometer which he is using to check wind velocities around the Neighborhood on behalf of Donkey Hodie.
In the Neighborhood of Make-Believe, Scientist Alder continues checking wind speeds to help Donkey Hodie as he looks for an ideal place to build a windmill. After checking wind speeds throughout the Neighborhood of Make-Believe, Scientist Alder determines that the best location for a windmill is behind the castle. Unfortunately, King Friday says that he likes his privacy and there is no royal land available.
Back at the house, Mister Rogers demonstrates an electric fan and suggests that there are some things that only grown-ups are allowed to use. After singing Parents Were Little Once Too, he concludes by demonstrating different kinds of fans.
For details and more screenshots from Episode 0019 of Mister Rogers' Neighborhood, visit the Neighborhood Archive.