A new type of compass declinometer

The magnetic field work of the United States Coast and Geodetic Survey in the United States and outlying territory under their jurisdiction is performed by regularly equipped magnetic parties in charge of magnetic observers, and as incidental work by survey parties engaged in geodetic, topographic, hydrographic, or other surveying duties. The regular magnetic parties are‐supplied with a complete magnetic outfit consisting of a theodolite magnetometer, dip circle, pocket chronometer, small accessories, and a nonmagnetic observing tent. General survey parties, especially when working in remote regions, such as Alaska or the Philippines, are usually furnished with a compass declinometer or other instrument for determining the magnetic.declination in connection with their triangulation or other work, where the azimuths of lines are already known. In this way it has been possible to ascertain the magnetic declination at many places at nominal cost and in advance of the general magnetic survey.