Lot 79: Two Industrial Brass-Cased Thermometers including one by Harkness & Son Ltd

Two industrial thermometers, each comprising a glass tube set within a protective cylindrical brass housing against a graduated metal scale. The first thermometer features a scale from 20 to 360 degrees Fahrenheit, a threaded mounting stem, and is topped with a red plastic cap. The second, larger thermometer ranges from 20 to 500 degrees Fahrenheit and terminates in a perforated probe. This instrument features a metal scale plate printed with the name HARKNESS & SON LTD, LONDON and the origin MADE IN ENGLAND. Both instruments are designed for insertion into industrial pipelines or boilers for temperature monitoring.