That's a pretty fast exposure for 1901! Daylight? Flash powder? Cyclists performing on the bicycle track on stage at Keith's Union Square Theatre, NYC. From the Collections of the Museum of the City of New York Photographer: Byron Company (NY) ca.1901
I have several projects in various stages of production but this is something we recently finished. No matter how much still photography you have under your belt, adding the dimension of motion and extended time within the frame takes a bit of getting used to.