The report covers the work undertaken in establishing and operating for a period of six months an S.D.I. service in the field of precision engineering. The performance and costs of the system are given and the problems which would be involved in a commercial operation are considered. The view is taken that it would be difficult for a system of this type to be economically viable in the short term.A project supported by a grant from Pergamon Press Ltd. and I.C.L. Ltd
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