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Whatever, this is excellent news for all those interested in dialling.Not only that but Ian has combined a list of these on his Google drive.

John deduces that the elaborately engraved dial may have been made for Hughes by one of the Owen dynasty of clockmakers perhaps using components from the clockmaking area around Prescot in Lancashire.

Way back in 1992, Peter Ransom, later to be elected President of the Mathematical Association, published a fascinating article extolling the use of old scientific instruments when teaching geometry in schools.