From each camera shutter, a string was stretched across the track, so that when the horse galloped along, it hit the strings and tripped the shutters.
No katras fotokameras slēdža pāri skrejceļam bija nostiepta aukla, lai zirgs, auļodams pa ceļu, šīs auklas parautu un tiktu izdarīti fotouzņēmumi.