The phrase "a sill of" is correct and usable in written English.
It can be used to describe a specific type of architectural feature, typically referring to a horizontal ledge or surface at the bottom of a window or door frame.
Example: "The carpenter installed a new window, ensuring that the sill of the frame was perfectly level."
Alternatives: "a ledge of" or "a threshold of".
It is on a window sill on the Via Garibaldi, not on a sill of the United States pavilion.
After a scramble up a rubble-strewn incline, we rested in a large watchtower, each sitting on a sill of one of the several windows.
There is a car-sized window cut into the rock, looming out over the abyss below, with a sill of crumbling rock perhaps three feet across.
Assuming the spatial variation of air pollutants to be isotropic, scaled semivariograms were constructed and modeled as a function of the distance between observations, h, using a sill of 1, nugget values derived from collocated measurement time-series described in previous work, and least squares regression to determine the range [ 15].
Apparent depth of deformation depends both on the processes detected (e.g., the intrusion of a sill, overpressure of (part of) a reservoir or ascent of a diapir) and on the approach taken to modelling the geodetic data.
A Gaussian variogram model having correlation range of 20 grid blocks and with a sill value of 1 were used to estimate the permeability of each grid block in the realizations.
More importantly he knows the geology beneath his feet, and knows which stones – "malmstone, greensand, sandstone, chalk" – are soft enough to hold the impression of passing feet, for "like creases in the hand, or the wear on a stone sill of a doorstep or stair", holloways "are the result of repeated human actions.
To the northeast the Mediterranean is connected with the Black Sea through the Dardanelles (with a sill depth of 230 feet [70 metres]), the Sea of Marmara, and the strait of the Bosporus (sill depth of about 300 feet [90 metres]).
A submarine ridge between the island of Sicily and the African coast with a sill depth of about 1,200 feet (365 metres) divides the Mediterranean Sea into western and eastern parts.
And where her navel had been, like a button caught in a seam at an angle, was an asymmetric whorl with a little sill of skin.
The Nicaraguan Rise, a wide triangular ridge with a sill depth of about 4,000 feet (1,200 metres), extends from Honduras and Nicaragua to Hispaniola, bearing the island of Jamaica and separating the Cayman Basin from the Colombian Basin.
