The principles of Loran are thoroughly treated with considerable attention being paid to the geometry of Loran, indicating the service area of the pair, triplets, chains and quadrilaterals. Different types have been developed, namely, standard Loran, sky-wave synchronized Loran, and low frequency Loran. Procedures for its use in navigation are indicated and a chapter on future trends considers possible developments and uses.
Part II is devoted to Loran equipment with chapters on timers, switching equipment, transmitters, antenna systems, and receiver-indicators. This material is quite detailed on the special applications and includes many diagrams, both schematic and block. An appendix gives the Loran program in the Hydrographic Office, a list of Loran ground stations and other data. The bibliography is comprehensive and provides a helpful indication of where material may be secured, especially necessary because of the nature of much of the material cited.
This volume well serves its purpose of recording the development of Loran and until significant changes occur, will undoubtedly remain the standard work on the subject.