Abney Level, Glossary and Terms, Amusement, Recreation & Ticket Services

U.S Amusement & Recreation List of United States Amusement & Recreation Services, Ticket Service, Guide Service

"Abney Level"

Hand-held instrument that is adjusted like a sextant and can be set to a fixed gradient. The user sights through the Abney to a fixed reference (usually a second person) until the crosshair bisects the bubble, this indicates the preset grade.

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