• A scientific barometer on the Fortin principle signed on the silvered scale J.B. Dancer, Optician, Manchester No. 282.
   
• The instrument has a black painted tube with a thermometer mounted on the front.
   
• The barometer scale reads from 27 to 32.5 inches of mercury, the thermometer scale from 25 to 110 degrees Fahrenheit.
   
• The instrument is mounted on a mahogany backboard with white reflectors to improve reading accuracy.
   
• Backboard size 44 inches x 5½ inches.
   
• The barometer has a replacement glass reservoir.
   

John Benjamin Dancer supplied instruments to the famous scientists John Dalton and J.P. Joule