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The New Zealand Railways Magazine, Volume 5, Issue 9 (April 1, 1931)

Making Observations with a Theodolite

Making Observations with a Theodolite.

To observe any angle, either horizontal or vertical, made by two objects with the position occupied by the instrument, all that is required is to bring one object into focus with the telescope centre, clamp the lower plate in that position, read the bearing or angle made by the adjoining plate, and swing the telescope to the second object. The top plate turns with the telescope, and on reading the bearing now made by the two plates, the angle traversed by turning the telescope from one object to the other may be read off the scale.

To place a number of marks or stations in any given direction the horizontal plates are clamped together, the telescope pointed in the desired direction and then moved vertically and focussed on each mark as required. This is a brief and very elementary description of a theodolite and its use.