from The Century Dictionary and Cyclopedia
- n. In mining, the purest and finest white tin, smelted with charcoal, which never had any brood or foreign admixture in the mine.
Sorry, no etymologies found.
'Streaming' for tin was very much practised in the Middle Ages, and the sides of valleys all over Dartmoor are scored with the works of the tin-streamers, who turned about the streams and examined the beds for 'grain-tin.'
In this process, nothing ought to be used but pure grain-tin.
M. Sonnerat reports that this tin (named calin by the French writers), was analysed by M. Daubenton, who found it to be the same metal as that produced in England; but it sells something higher than our grain-tin.