Brick
Low-fired bricks produced by the Colonial Williamsburg Brickyard that were sent to Puerto Rico for crushing.
DFC Hifire aka Denver Fire Clay Company
Source:
Denver Fire Clay Mine opened in 1882 (https://www.protectthehogback.com/copy-of-denver-fire-clay-accident-1937-1)
https://americanhistory.si.edu/collections/SILNMAHTL_13859
In 1900, Guastavino setup a makeshift factory in a former Woburn church. By 1903, the temporary facility was firing over 200,000 tiles annually. Guastavino then purchased this Woburn property. Guastavino II, a young and talented engineer, designed the new factory. The Woburn tile factory bears similar massing to the Battló Factory in Barcelona, Spain, designed by Guastavino in 1871. In a 1907 dedication, a local Woburn paper described it as “an ornamental brick building that looks more like an art museum than a factory.” This delighted the stylish Guastavinos.
Rafael Guastavino was a master of the vernacular building traditions of the region, including the thin-tile structural system. This engineering technique – which dates back at least to the 14th century – involved spanning broad spaces with arched ceilings or domes composed of several layers of thin tiles bound with mortar. In the early stages of his professional career, Guastavino perfected this system by sandwiching the tiles together with quick-drying Portland cement and plaster, which was stronger and more water-resistant than the lime mortar that had been traditionally used.
Source:
Our Place – Guashttps://www.tocci.com/our-headquarters/tavino’s Tile Factory (tocci.com)
From Lynch (2009): “s. From initial observation, the tan color seems to indicate that the clay came from Lake Pontchartrain. The sample also has iron spots on the surface. The brick does not have a brickmaker’s stamp, although it is likely that the brick dates to the 1830s. This sample is regular in shape, has sharp edges, and is struck from header to header across the bedding face. The strike marks on the brick indicate that it was struck with a metal striking instrument, which is consistent with the period. The presence of sand in the surface indicates that sand was used as a molding lubricant. Given these characteristics, the brick appears to have been hand-made using the soft-mud method.”