Horizontal and vertical circle readings are made to the nearest minute. accuracy for an instrument of this type and size, because of the coincidence setting of the diametrically-opposite parts of the circle. Compass) Circle readings are of unusually high. As this lever returns to its original position when released, thus raising the circle, the pivot can be damaged only as a result of particularly careless mishandling. The compass theodolite has a spring lever which to be moved to lower the compass circle onto its pivot. The T0 can also be used for photogrammetric ground control surveys, low-order detailing, on building sites or as a recon- naissance instrument. It is particularly useful for rapid traversing, based on magnetic bearings, especially in areas where visibility is limited and the traverse legs likely to be short. The Wild T0 Compass Theodolite is a compact lightweight instrument, which can be used either for observing and setting-out magnetic bearings or as a normal theodolite for measuring or turning-off angles.
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