Tag: clamp
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Alum Clamp, Ayton Bank
The small knoll in the photo is an alum clamp, a relic of an 18c chemical industry to produce alum. Alum had many uses: medicinal, in tanning to make leather supple and durable, as a mordant in dyeing cloth. It does occur naturally and is known to have been used by the Greeks but on Ayton Bank and in other parts of…