It is designed for very accurate work, and when a few pounds of additional weight are not objectionable. The large diameter of the objective particularly adapts this instrument for city surveys, since it permits work to be done under unfavorable atmospheric conditions. The magnifying power is quickly adjusted by means of the variable power eyepiece to suit the state of the atmosphere, low powers being used under unfavorable conditions, so that the objective gives a clearly defined field well illuminated. While the telescope as regularly furnished is erecting, an inverting telescope will be sup plied if desired. The design includes the continuous variation plate, and the plate levels mounted inside the compass box.
All centers have long bearings, insuring great accuracy.
The graduations read to single minutes by double opposite verniers. The telescope axis carries a center-point which is exactly over the center when the instrument is leveled up and the telescope is horizontal. The axis is also provided with clamp and tangent screw. The four German silver leveling screws are provided with dust-caps. The Saegmuller solar attachment is capable of being used as an auxiliary to the telescope for vertical sighting.