campbell-stokes recorder
Very LowTechnical / Scientific
Definition
Meaning
A meteorological instrument that measures sunshine duration using a glass sphere to burn a trace onto a calibrated card.
A specific type of sunshine recorder, invented in the 19th century, which provides an analog record of the intensity and duration of bright sunshine by focusing the sun's rays onto a strip of treated paper, leaving a scorched trace. It is the longest-standing standard instrument for this measurement.
Linguistics
Semantic Notes
This is a proper noun compound term (eponymous), named after its inventors, John Francis Campbell (1822-1885) and Sir George Gabriel Stokes (1819-1903). It refers to one specific instrument model and is thus a highly specialized technical term.
Dialectal Variation
British vs American Usage
Differences
No lexical differences. The term is identical and standard in both British and American English meteorological contexts.
Connotations
Primarily historical or traditional in modern contexts, as it is an analog instrument largely superseded by electronic sensors. May evoke a sense of classic meteorology.
Frequency
Extremely low in general usage. Slightly more likely to be encountered in British texts due to the instrument's historical use by the UK Met Office.
Vocabulary
Collocations
Grammar
Valency Patterns
The [Campbell-Stokes recorder] [verb: recorded, measured, showed] [sunshine duration].Data from the [Campbell-Stokes recorder] [verb: was analysed, indicated].Vocabulary
Synonyms
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Virtually never used.
Academic
Used in historical or meteorological papers, especially those discussing long-term climate records or instrument history.
Everyday
Extremely rare. Unlikely to be used outside specific educational or hobbyist contexts.
Technical
The primary domain. Used in meteorology, climatology, and environmental science to refer to this specific instrument.
Examples
By Part of Speech
adjective
British English
- The Campbell-Stokes recorder data is held in the archives.
- It was a classic Campbell-Stokes recorder design.
American English
- Campbell-Stokes recorder measurements form the basis of the historical dataset.
- They compared the new sensor to the Campbell-Stokes recorder results.
Examples
By CEFR Level
- Old weather stations sometimes used a Campbell-Stokes recorder.
- The instrument burns a line on a card when the sun shines.
- The Campbell-Stokes recorder, invented in the 19th century, provides a physical record of sunshine hours by focusing rays through a glass sphere.
- Meteorologists must replace the card in the Campbell-Stokes recorder daily to get an accurate trace.
- While largely superseded by electronic sensors, the century-long datasets derived from Campbell-Stokes recorders remain invaluable for climatological trend analysis.
- The calibration of the Campbell-Stokes recorder's burn trace depends on solar intensity and card type, introducing sources of measurement uncertainty.
Learning
Memory Aids
Mnemonic
Campbell and Stokes CAMPed out to record the SUN's STOKES (stokes a fire) on paper.
Conceptual Metaphor
THE SUN IS A BURNING LENS (The instrument conceptualizes the sun as a force that literally burns a record of its presence).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid direct translation of 'recorder' as 'диктофон' (dictaphone). The correct translation is 'регистратор' or 'самописец'.
- The hyphenated names must be kept together; it is not a 'recorder of Campbell-Stokes' but a single compound term 'Campbell-Stokes recorder'.
Common Mistakes
- Misspelling: 'Cambell-Stokes', 'Campbell-Stoke', 'Campbell-Stokes Recorder' (capitalizing 'recorder' unnecessarily).
- Using it as a generic term for any sunshine measuring device.
- Incorrect plural: 'Campbell-Stokes recorder' -> 'Campbell-Stokes recorders' (the 's' goes on 'recorders', not 'Stokes').
Practice
Quiz
What is the primary function of a Campbell-Stokes recorder?
FAQ
Frequently Asked Questions
While many official meteorological stations have switched to electronic sensors, some still use Campbell-Stokes recorders for consistency with long-term historical records, and they are common in educational or amateur settings.
You examine the specially graded card placed in the instrument. The length and thickness of the burned trace indicate the duration and, roughly, the intensity of bright sunshine for that day.
It was initially conceived by John Francis Campbell in 1853 and later refined into its modern spherical form by Sir George Gabriel Stokes in 1879.
It only records 'bright' sunshine (when the sun is strong enough to burn the card), requires daily manual card changes, is subject to interpretation of the burn trace, and does not function in overcast or rainy conditions.