So far, this is logical enough. He then identifies a candidate for where to look: the Seuton Grant House, once the oldest surviving great house in Newport before it was demolished in the 1890s. The house, built around 1670 or so, bore the name of its most famous occupant, Seuton Grant, who lived there after 1725. The Sueton Grant House was something of an architectural anomaly in Newport, for it had the only pre-1700 central stone chimney in the settlement, all the others having been made of less expensive brick.
The basement of the house was unusual for its time, being made of stone vaults in the European style. Thompson identifies these vaults as a medieval lime kiln, which he dates—based on no evidence other than his impression of a photograph—to 1370-1400 CE. Based on his viewing of the photo, he also believes the kiln ran on coal imported from Baffin Island.
The Colonial builder used the preexisting medieval lime kiln sections as a convenient foundation for three chimneys that were built above the ground floor. Photos show that the chimney superstructure is out-of-alignment by a meter on the east side; and this indicates that the foundation units of the kiln were not originally planned as part of a house foundation. Use of the structure as a kiln was determined by photos that revealed the presence of distinctive lime-kiln “vents.” These are situated above the north and south archways. These vents are common in medieval kilns that were built in the British Isles. Foundation vents of this type are otherwise totally unknown in Colonial New England.
The arrangement of the stairs is peculiar. The two piers at each side of the flight come together above the stairs in the second story. Under the stairs in the first story are the steps to the cellar, which is very interesting, for the foundation of the huge chimney instead of being a square mass of stone, is cut into on three sides by deep recesses, which are arched over to support the masonry above them. The recess on the fourth side is occupied by the stairs from the first story. We more than suspect that these arches were turned by the same mason who built the Old Stone Mill. This arrangement occurs outside of Newport only, so far as we know, in the Lippitt house in old Warwick, of which the chimney is of brick.
According to Thompson, the unfinished, rough character of the arches in the basement marks the site as a “distinctly” Norman-Scottish medieval kiln, for he argues that no other colonial site (barring the Newport Tower) contains wide arches made from uneven stones. He compares the Seuton Grant House to a medieval Orkney church repair in this image posted on his Marco Polo in America website in 2014, before suspected that the colonial stonework was a kiln (and thus redrew the photograph, which appears only in the altered drawing form in his subsequent claims):
So why compare a flat arch to a Gothic one? Because Orkney is where Jarl Henry I Sinclair lived, and by imagining a colonial basement as a fourteenth century Scottish kiln, Thompson can lend spurious support to his fantasy that Henry Sinclair ruled over a far-flung colony in New England and shipped Mi’kmaq people back to Europe (yes, he really claims this). As I have demonstrated many times, there is no evidence whatsoever of Henry Sinclair traveling to America, and the entire claim rests on a sixteenth century hoax that doesn’t even mention him.