the.com/old faithful

Geyser that keeps every promise, which is more than you can say for most people.

means A person or thing so reliably predictable and dependable that you can set your watch — or your trust — by it.

from Borrowed directly from the famous geyser in Yellowstone National Park, named in 1870 by an early exploring expedition because of its startlingly regular eruptions — reliable enough to time a picnic around. The geyser's name migrated into everyday English as a nickname for anything or anyone that performs with the same stubborn, comforting regularity, from an old car to a loyal friend.

eruption interval
roughly 44 to 125 minutes, not clockwork but close
height
shoots water 106 to 185 feet high
name origin
named in 1870 for sheer predictability, not size
water source
rain and snow from centuries ago, recycled underground
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