I don't know when mum got this, Cornish serpentine barometer, I did check her wedding present list and it is not on that. They did go to Newquay in Cornwall for their honeymoon so maybe they bought it then.
I'd like to get the glass replaced and get it back in working order, but think it would cost a lot of money and I have no idea where to go to get that done.
It is found at the foot of the Lizard peninsula, Cornwall's most southerly point. Although it occurs elsewhere, the Cornish variety is uniquely coloured; dark green, red or grey, run through with contrasting seams, and it polishes like marble to a wonderfully deep sheen.It was first used to build homes and farm buildings in the Lizard, but in the early 19th century a man who was repairing the peninsula’s lighthouse developed a polishing technique to buff it to a fine lustre and opened a business.
However, it was not until Queen Victoria and Prince Albert, on their honeymoon, called at the town aboard the royal yacht and they saw the polished serpentine and ordered some pieces for their Isle of Wight home that it became fashionable.
Nowadays it is holiday makers that keep the serpentine trade alive.