[Engineering Version] Daily Question 20180613

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The difference in the use of the foot screw between a level and a theodolite is ( ). A. The telescope’s adjustment screw is used for centering and precise leveling, while the level’s adjustment screw is used for rough leveling. B. The telescope’s adjustment screw is used for rough leveling and precise leveling, while the level’s adjustment screw is used for rough leveling. C. The telescope’s adjustment screw is used for centering and precise leveling, while the level’s adjustment screw is used for precise leveling. D. The telescope’s adjustment screw is used for rough leveling and yet more rough leveling, while the level’s adjustment screw is used for precise leveling. Answer: A 【Explanation】When setting up a theodolite, rotating the adjustment screw is used to align the aiming circle precisely with the center of the survey point; the error in optical centering should be less than 1 mm. Leveling: Rotate the aiming unit so that the level tube of the aiming unit is in the centered position; rotate the foot screws 1 and 2 to center the level bubble ； Then rotate the aiming unit 900 and turn the foot screw 3 to center the level bubble. Repeat this process until the aiming mechanism is turned to any position at which the bubble remains centered.