douglas scale
Very Low (Technical)Technical/Scientific
Definition
Meaning
A specific, multi-level ordinal measurement scale for assessing sea state.
In meteorology and oceanography, a standard scale (from 0 to 9) for visually estimating and reporting the height, period, and character of wind-generated waves at sea. It is named after Henry Percy Douglas, a British naval officer and hydrographer.
Linguistics
Semantic Notes
Always used as a proper noun with 'scale'. It is a defined technical standard, not a subjective measure. References are typically to 'the Douglas scale', 'Douglas sea scale', or 'Douglas scale number'.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. The scale is internationally recognized under this name. Historical British sources may use 'Douglas Sea Scale' more frequently.
Connotations
Technical, precise, historical (originating in the early 20th century).
Frequency
Extremely rare in general discourse. Used with equal but low frequency in UK and US technical maritime/meteorological contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
The sea state was recorded as [Douglas scale number] on the Douglas scale.Waves were classified using the Douglas scale.Vocabulary
Synonyms
Neutral
Weak
Usage
Context Usage
Business
Not used.
Academic
Used in oceanography, meteorology, and naval architecture papers when discussing historical data or visual observations.
Everyday
Virtually never used.
Technical
Primary context. Used in marine weather reports, ship logs, and meteorological manuals.
Examples
By CEFR Level
- Sailors sometimes use the Douglas scale to describe the sea.
- The weather report indicated a Douglas scale reading of 6, corresponding to very rough seas with wave heights of 4-6 metres.
- While modern instruments provide precise wave data, the Douglas scale remains a valuable tool for the rapid visual assessment of sea state in operational maritime contexts.
Learning
Memory Aids
Mnemonic
Think of Douglas navigating the DOUG-LAS (two parts) of a wave: its height and its character, scaled from 0 to 9.
Conceptual Metaphor
MEASUREMENT IS HIERARCHY (a ladder of severity from calm to phenomenal).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid translating 'Douglas' as 'Дуглас' in a technical text; the standard term is 'шкала состояния моря' or specified as 'шкала Дугласа'.
- It is not a 'шкала Дугласа' for measuring objects; it is exclusively for sea state.
Common Mistakes
- Using it as a verb (e.g., 'to douglas scale the waves').
- Referring to it without 'scale' (e.g., 'a Douglas of 5').
- Confusing it with the Beaufort scale (for wind force).
Practice
Quiz
What does the Douglas scale measure?
FAQ
Frequently Asked Questions
Yes, primarily in visual observations and certain standard reports, though it is often supplemented or replaced by instrumental data.
9, described as 'phenomenal' seas with wave heights exceeding 14 metres.
It is named after Admiral Sir Henry Percy Douglas, a British hydrographer of the Navy.
The Beaufort scale measures wind force based on its observable effects on land and sea, while the Douglas scale specifically categorises the state of the sea itself (wave height and character).