Portable barometer by Daniel Quare, 1695-1705.
© Science Museum / Science & Society Picture Library
Daniel Quare obtained a patent for a barometer design in 1695. This claimed that the barometer could be inverted without either spilling the mercury or allowing air to get into the tube. Although his main busines was as a clockmaker, Quare was also a succesful barometer maker, and many examples of his work survive.