#Philadelphia
Stories tagged “Philadelphia” in the Weird Science History archive — 2 stories connected by this topic.
- The Perpetual Motion Machine Secretly Powered by an Old Man Upstairs Eating Bread
- The Motor That Ran for Twenty-Six Years on a Secret Room Full of Compressed Air
Related topics: #perpetual motion #physics #Charles Redheffer #Gilded Age #history of science #hoaxes #investor fraud #New York