Joannes b. Cerutti bak barometer, nijmegen c1820
A dutch bak barometer by joannes baptist cerutti circa 1820. In the barometer is a barometer, thermometer and a controller with a pewter scale. The centre tube has a scale in english thumbs, combined with the 36-scale, and a scale in rijnlandse thumbs. The controling tube has a scale consist of 25 parts of the 36-scale. The thermometer has a scale in reaumur and fahrenheit. Length 125 cm.