Cleverdon, Cyril W.Harding, P.2007-01-052007-01-051970http://hdl.handle.net/1826/1364The 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.4158067 bytesapplication/pdfenTechnical Report