Inclined wood plane 600 x 75 mm with pulley at one end, the other being hinged to wood base. A metal FORTINS BAROMETER

A 6 mm glass tube contained in an brass case, mounted on a polished wooden board with plates for fixing to wall, open plate reflectors and ring and screws for vertical adjustment. The silvered scales, graduated in inches and mm are read by vernier moving by Rack and Pinion to 1/200 in and 1/10 mm and are enclosed in glass cylinder. A glass cylinder at the lower end of the Barometer is provided with an ivory point to which the level of the mercury in the cistern is adjusted before readings are taken. Fitted with thermometer with centigrade and Fahrenheit scale. Supplied without mercury.