THIS previously unrecorded George II mahogany ‘sign post’ angle barometer was made by the gifted mechanician and scientist John Whitehurst (1713-1788) of Derby.
Whitehurst, who made instruments for Matthew Boulton, pioneered
both the wheel and angle barometer as well as making a variety of
stick and other types.
The angle barometers were, however, his most accomplished
pieces, and before the emergence of the present example, only 24
were known, just 11 of them dated. They are all in mahogany cases
in two basic sizes, and the present example is of the smaller sort
at 21in (53cm) high.
Whitehurst was a keen meteorologist and in the 1740s developed a
0-60 scale to express barometric pressure that he believed would be
more practical than the usual 28-31 inch scale. It has been said
that he invented the millibar a century and a half early - although
ultimately it failed to catch on.
Whitehurst's nephew and successor continued to make barometers
of this type for about a decade, before dropping them in favour of
more conventional types.
This example, inscribed to the silvered register Whitehurst,
Derby 1757, is marked with Whitehurst's unique 0-60 scale.
Only two surviving examples of Whitehurst angle barometers bear
earlier dates, one sold in New York in 1985 dated 1747 and one in a
Derbyshire country house dated 1751.
The new discovery was found behind a wardrobe in a Derbyshire
village and included in Bamfords' March 17-19 sale
in Derby, estimated at £5000-8000.
Some restoration was needed to the crossbanded case but as an
instrument it was deemed to be in wholly original condition.
Interest arrived from many quarters including three museums - one
local, one in London and one in the US.
When bidding reached £19,000 (plus 15 per cent buyer's premium)
it sold to the Derbyshire museum who were underbid by a local