the.com/altimeter
The needle that decides whether the ground stays a metaphor.
means An instrument that measures altitude — how high something is above sea level or the ground — most often used in aircraft and on mountaineering watches.
from A 19th-century technical mashup: Latin 'altus' (high) — the same root that gives us 'altitude' and 'exalt' — bolted onto '-meter,' from Greek 'metron' (measure), the workhorse suffix that also built 'thermometer' and 'barometer.' A Latin-Greek hybrid, the kind of word coined by scientists who cared more about clarity than linguistic purity.
- pressure trick
- Measures air pressure, not actual height
- deadly lag
- Wrong setting has crashed loaded airliners into mountains
- set before flight
- Pilots calibrate it to local pressure constantly
- watch envy
- Wristwatch versions guess altitude via barometer
- radio cousin
- Radar altimeters bounce signals straight down
everest base camp altimeter — measures altitude at 5,364m on mount everest's south side in nepal
concorde mach meter altimeter — displayed altitude up to 123,520 feet during supersonic flights 1969-2003
challenger deep depth gauge — measured 10,994 meters below sea level in the mariana trench in 1997