Davis Ranger: Going the Distance

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NOTE: in the video I accidentally state that a furlong is 220 feet when it is actually 220 yards.

Introduced by the Davis Instrument Corporation in 1969, the Davis Ranger is a type of Stadimeter, an instrument which uses the known size of an object to calculate its distance. It is one of many different designs for optical rangefinders which have been developed over the last 200 years.

SOURCES:

https://patents.google.com/patent/US8...
https://patents.google.com/patent/US4...
https://www.skipjackmarinegallery.com...
https://www.britannica.com/biography/...
https://www.worthpoint.com/worthopedi...
https://www.navalgazing.net/Rangefinding
https://patents.google.com/patent/US3...
https://www.prc68.com/I/RF.shtml