I already threw a lot of stuff at you in post 008 about the comic uses of human pyramids (On the Shoulders of Giants: From the 2-High to the 1200-High). Since then I discovered these two short but very cool clips of the Julians Acrobats from 1902-3. It’s not comedy, but the series of rapid-fire two-high, risley (foot juggling of people), and tumbling moves is fantastic. The clips are similar and very likely shot at the same time, but with some different tricks in each one. You gotta love the group choreography.
Chapter 5 from my book, Clowns: A Panoramic History
One more background piece. This chapter from my 1976 history of clowns dealt in detail with the development of physical comedy in the nineteenth century and, ultimately, its influence on American silent film comedy. Good stuff!

My book Clowns has long been out of print, but you can borrow it for two weeks at a time from the Internet Archive. More information is available here.
Visual and verbal humor for the cognitively and artistically curious! Available here.
“A book to treasure!”
—Bill Irwin