this report presents a review of primary suspension systems which are alternatives to the wheel,with comparison of their individual merits and limitations.the characteristics of permanent magnets,active magnetic systems,superconducting systems and air cushions are discussed.of the suspensions discussed,the application of air cushion technology was found to be already under consideration for a broad spectrum of transport systems.active magnetic suspension,on the other hand,seems to merit further study for urban applications.superconducting magnet suspensions are suggested as worth closer definition for high speed ground transportation.(a)

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