On Sat, 22 Aug 2020 18:34:24 +0100, Max Demian wrote:

"Zanzibar effect" (with the quotes) gives (me) this as the first result:
https://metrology.wordpress.com/stat.../basic-theory-
of-measurement-and-error/trueness-%E2%80%93-calibration-and-traceability/

"The famous story of the retired sea-captain on the island who takes his
time from the watchmaker in town only to find out that the watchmaker
uses the sea-captains cannon shots at 12 noon each day to set his own
clocks! [Attributed to Harrison (MIT) by Petley.]"

Rather nice that the story involves someone called Harrison.



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