naismith's rule

World English Dictionary
Naismith's rule (ˈneɪsmɪθs)
 
n
mountaineering a rule of thumb for calculating the time needed for a climbing expedition, allowing 1 hour for every 3 miles of distance plus 1 hour for every 2000 feet of height
 
[C19: named after W. W. Naismith (1856--1935), Scottish climber, who formulated it]

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