Cil-yr-ychen Lime Kilns

Cil-yr-ychen Lime Kilns is a significant group of lime kilns, with the oldest section located on the left. This part features a battered front wall and a row of six large pointed-arch openings at ground level, creating an arcade. Above each arch, there are pairs of pointed-arched machicolations that support a projecting brick parapet, which is adorned with small quatrefoil openings arranged in line and circle patterns. The structure is topped with a cornice that has deep indentations resembling a corbel table.

To the right, there is a complex section that appears to have been altered and is architecturally incomplete, also designed in a Moorish style. This section includes triple pointed-arched machicolations over the left kiln, a gap, then incomplete triple-arch machicolations over a second kiln, a blank bay with incomplete quadruple machicolations, and finally a third kiln featuring completed quadruple machicolations. This part does not have a crowning cornice and likely represents the limit of the kilns built by Penson.

Further to the right, there is a strongly battered single-arch section of plain design that contains three kilns, likely from the third phase of the Penson and Southern period. Lastly, there is a tall phase four unit made of concrete with three arches, containing two kilns, probably built in the mid-20th century, which is only decorated with a string course at the base of its parapet.

Penson's original kilns differ from the typical design of the time, where access is usually provided at one or two points at the base of the kiln through tunnel-like working arches. Instead, Penson's kilns are designed for all-round access, similar to industrial corn drying kilns. In the six-arched first set, there are only two kilns, but each can be discharged from three points. In contrast, kilns 3, 4, and 5 in the second set are conventional single access kilns. The kilns numbered 6, 7, and 8 in the battered structure are also single access, while the last two in the concrete structure offer dual access.