Lot Essay
Benjamin Martin (1704-1782) was a self-taught mathematician and lecturer on several scientific subjects, he settled in Fleet Street as an optician in 1756 and became a noted optical, mathematical and physical instrument maker. Martin was visited in 1769 by Jean Bernoulli, the astronomer to the King of Prussia, who noted his 'beaux instrumens' were Martin's advantage over the more eminent scientific lecturer James Ferguson.
Sir Nicholas Goodison noted: This is another but much grander example of Martin's 'Triple Weather Glass' or 'Aerometrum Magnum' as he described it in 1756 in an advertisement appended to 'An Essay on Visual Glasses', a tract which he issued from his shop in Fleet Street. The barometer is very close to the illustration in the tract (see Goodison, 1977, (op. cit.) pl. 118, p. 180).