SLIDING SEAT • DICCIONARIO INGLES.COM • Definition of Sliding seat

... cold air of the Englishes' barn, which was situated in an alley-way, the block above their house, Bobby and Johnny examined the cart, admired its glossy newness, and, under the coachman's instructions, experimented with the sliding seat. They took a peek through the folding door into the stable where stood the haughty horses. These, still chewing, slightly turned their heads and rolled their fine eyes back at the intruders, then, with a high-headed indifference, returned to their hay. After this the boys ...

— The Adventures of Bobby Orde • Stewart Edward White