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adjustment alidade angle of 30 back reading bearing Bisect chain line circle construct contour convenient curved describe an arc describe arcs diagonal scale diaphragm distance divided draw a line draw lines drawn Dumpy level edge error eye-piece feet field-book figure fixed flag foot foot-screws fore reading ground height hence horizontal plane inches inches long instrument intersection length Let A B line A B line of collimation line parallel magnetic magnetic bearing measured meridian method necessary needle object glass obtained offsets paper parallax parallelogram pencil perpendicular perspective projection picture plane placed plane-table plotted position primary scale prism prismatic compass protractor radius describe rays rectangle reduced level regular polygon represent rhombus right angles screws sides sight-vane spirit level square staff station straight line surface survey surveyor telescope tion triangle Vernier scale vertical plane XY line