You are looking for a nano cache placed next to, but outside the kiln itself. Care must be taken in wet conditions and children should be closely supervised.
This kiln served the community of Airton for centuries. Field lime kilns such as this example were built to burn limestone. The quicklime produced was then slaked with water to produce calcium hydroxide (slaked lime). This was mostly used to improve grassland by reducing the acidity of the soil, especially of intake land or reclaimed moorland during the enclosures of the 18th and 19th centuries.
Slaked lime was also an important ingredient in making lime mortar. Lime mortar is a type of mortar composed of lime and an aggregate such as sand, mixed with water. It is one of the oldest known types of mortar, dating back to the 4th century BC! Despite its enduring utility over many centuries, lime mortar's effectiveness as a building material has not been well understood; time-honoured practices were based on tradition, folklore and trade knowledge, vindicated by the vast number of old buildings that remain standing. Only during the last few decades has testing provided a scientific understanding of its remarkable durability. The 17th & 18th century stone houses & barns in Airton and throughout Malhamdale are bonded with lime mortar.
Hair reinforcement is not found in lime mortars, but is common in lime plaster and many types of hair and other organic fibres can be found in historic plasters. The interior plasters in the older stone houses locally are lime plasters.
For a visit to a nearby spectacular industrial scale lime kiln a visit to The Hoffmann kiln at Langcliffe, near Settle, built in 1873 is well worth the trip. The Hoffmann Continuous kiln had been patented in 1858 by its German inventor Friedrich Hoffmann. The version built at Langcliffe had 22 individual burning chambers. Langcliffe’s Hoffmann kiln is almost unique in Britain; most others of this kind that once existed have either been demolished or have simply crumbled away. ‘Hoffmann Kiln (Yorkshire Dales)’ is the name of the cache there & the number of favourite points it has been given is testament to how interesting that site is!