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crosswireandhangaprism,etc.Compensationdevicehasa"place", whenthetelescopeviewslightlytilted, compensatingelementwillhaveaswing,inordertomakethemotionofthe"pendulum"cangetstableassoonaspossible,mustbepackedinaairdamper,ormagneticdamper. Thisinstrumentistiltinglevelhighefficiency,precision,stability,especiallyinthewindyandthetemperaturechangeisbigareasofoperation.

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