IN NATURE of September 15 a letter from Prof. A. F. C. Pollard points out that the cylindrical bearings adopted for the vertical axis of the Wild precision theodolite ...

The position of a pilot balloon or any other airborne target which is followed by two theodolites is usually computed by means of the known baselength (i.e., the distance between the two theodolite ...

This theodolite was designed in 1924 by Douglas L. Parkhurst, chief of the Instrument Division of the U. S. Coast and Geodetic Survey. It was made by August Heim, an instrument maker who worked with ...

THE ‘Wild precision theodolite’—a light-weight-type of primary triangulation instrument—is well known for the ingenuity and compactness of its design as well as for the superb workmanship exhibited in ...