Charlotte Webb wrote: > On 11/12/08, Carcharoth <[EMAIL PROTECTED]> wrote: >> Anyone know what a riser ring is? > > As far as I can see it most commonly refers to an apparatus (shaped > like one of those paper crowns you get at Burger King) which is used > for adjusting the angle of one's exercise bike.
Well, that's about all that shows up on the first page of a google images search, but in this context, a riser ring is the iron casing that forms the topmost part of a manhole opening. It's the ring on which the manhole cover rests. It's called a "riser" because it rises above the -- typically concrete -- underlying structure that the manhole provides access to. The riser's height is chosen to match the thickness of the asphalt/macadam roadway, so that the manhole cover ends up nice and flush with the final surface. _______________________________________________ WikiEN-l mailing list [email protected] To unsubscribe from this mailing list, visit: https://lists.wikimedia.org/mailman/listinfo/wikien-l
