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topliffe

In Cornwall, a measure of capacity for tin ore, about a half gallon.

sources

They measure their blacke Tynne, by the Gill, the Topliffe, the Dish and the Foote, which containeth a pint, a pottel, a gallon, and towards two gallons.

Richard Carew.
The Survey of Cornwall,...
London: Printed for B. Law in Ave-Mary-Lane; and J. Hewett, at Penzance, 1769.
Page 14.