Syphon travelling barometer by Nairne and Blunt, late 18th century. Syphon travelling barometer by Nairne and Blunt 1751-1800
Gay-Lussac syphon barometer by Negretti and Zambra, 1816. Gay-Lussac syphon barometer by Negretti and Zambra 1816
Barometer, part of the self-registering balanced magnetometer and barometer apparatus designed by Charles Brooke, c. 1850. Barometer, part of the self-registering balanced magnetometer and barometer apparatus designed by Charles Brooke 1801-1876