Quick Answer: The Thermometer, Ground Joint (Cone Type) is a borosilicate glass thermometer with a ground conical joint that fits straight into a distillation head or flask neck. Its bulb sits in the vapour path, and the scale is enclosed inside the glass.
Last updated: October 2026
Key Features
Ground glass conical joint, e.g. 14/23, 19/26 or 24/29
Low-expansion borosilicate glass
Enclosed (inclusion-type) scale protected from fumes
Stem length below the joint places the bulb in the vapour path
Graduations of 0.5°C or 1.0°C
Calibrated for partial immersion in distillation heads
Technical Specifications
Specification
Value
Joint
Standard taper ground glass, e.g. 14/23, 19/26 or 24/29
Material
Borosilicate glass
Sensing medium
Red spirit or mercury (model dependent)
Range
e.g. -10°C to +110°C or +250°C
Scale
Enclosed (inclusion type)
Graduation
0.5°C or 1.0°C
Calibration
Partial immersion within distillation heads
About This Product
In fractional and simple distillation the thermometer seals into the joint of the still head, so students can read the vapour temperature and identify each fraction by its boiling point without vapour escaping round the stem. It fits jointed glassware sets with the matching taper size.
Frequently Asked Questions
Which joint sizes are available for the cone type thermometer?
Examples given are 14/23, 19/26 and 24/29 ground glass joints; choose the size that matches the glassware.
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