The article gives a fairly extensive review of the available literature about low-H magnetic shielding. Beginning with ferromagnetic cylindrical shieldings, the theoretical design equations for transversal and longitudinal DC and low frequency (_??_1MHZ) AC fields, inclusive leakage fields from the ends, are presented, disussed and compared with actually designed shields. Experimental procedures (demagnetization and shaking), which help to raise the shielding ratio together with limits and problems of such shieldings are listed. Superconducting shielding is covered in three sections: stationary, rotating, and expanding (balloon-type) shieldings, and again, a survey of results achieved and limits of superconducting shieldings are presented. Finally, a short section covers the main features of active shielding with degaussing coils. An appendix outlines methods of shielding against strong fields and shortly discusses conventional low-H magnetometers. A list of the major literature is added.
The situation of researches and developments of high speed transport systems in Germany is presented. In Germany, many efforts are devoted to the development of magnetically levitated-linear motor driven-high speed transport systems. Two methods are now considered for the magnetic levitation. One is the electro-magnetic method utilizing magnetic attractive force between electro-magnet and iron track. Another is the electro-dynamic method utilizing magnetic repulsive force between superconduting coil and conductive sheet track. The system of practical train will be decided according to the test results of both methods at 75km test track. This new high speed transport system will connect München and Humburg in near future.