1824 – Born in Kincardine on Forth on the 20th of September.
1867 – Dewar described several chemical formulae for benzene.
1875 – Dewar became professor at the University of Cambridge.
1877 – Member of London’s Royal Institution.
1891 – He discovered a process to produce liquid oxygen in industrial quantities.
1905 – He observed that cold charcoal could produce a vacuum. This technique was quite useful for experiments in atomic physics.
1923 – Died in London on the 27th of March, and his remains were cremated at Golders Green.