Barometer with thermometer. Marine stick type. Brass.

The documentation accompanying this barometer claims it was presented to John Herschel by his friend, the fellow astronomer James South on their tour around the Alps in 1821. However, John's tour of the Alps in 1821, where he did indeed carry out some barometric observations, was not taken with James South. John was instead accompanied by his Cambridge friends, Charles Babbage, Richard Jones and George Peacock. John had however been working with James South prior to this trip at the latter's home Observatory. It seems plausible to suggest that this barometer was a gift from South for John to take on this tour.