I am trying to find the name of a old cartoon on Saturday mornings where I think a professor pulled the handle on a time machine and showcased historical times like dinosaurs, the western migration across America and like?
Maybe it was Once Upon a Time... Man? Children's programming, history, a professor, a kind-of-time-machine.
I hesitate to mention one of the worst cartoon series of all time but could it be The Fonz and the Happy Days Gang? (It matches the time frame and involved time travel).