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Extracted text: 12. TRIGONOMBTRIC LEVELING. Two points, A & B, are 3,134.50 From a third point, C, on the line bet ween A the meas ured vertical Determine due meters apart. and and 1,992.25 meters from A, в, to A is +35 28' and that difference to B is -15°14'. angle the allowance. in elevation bet ween A and B making for the effects of curvature and atmospheric re- fraction.