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W. Canning Materials Ltd have announced the appointment of Mr W. E. I. Galloway as Managing Director with effect from 1st January, 1985. The Company is a leading manufacturer and supplier of industrial and speciality chemicals for the surface finishing industry.

Circuit Technology, now in its fourth year, is still an event concentrating exclusively on PCB technology, production equipment and processes. Nevertheless, the organisers believe that Circuit Technology '86 will derive great benefit from participation in the UK's largest electronics gathering, The British Electronics Week.

PMD have appointed David H. Ormerod to the position of printed circuits products manager as part of their marketing organisation.

Multicore Solders Ltd are pleased to announce that Jack Saw, Paul Salmon, Gordon Clarke and Tom Perrett have joined their commercial division. The decision of Billiton Solders, UK, to sell the assets of their profitable solder division to the Cookson group released the aforementioned personnel who will be pleased to maintain their contacts in the industry and offer the same personal service as is the Multicore tradition.

Appointments Leitron GmbH In strengthening its Sales Division, Leitron GmbH of Schwäbisch‐Gmünd has appointed Mr Heinz Schunk to be responsible for General Management of Sales and Marketing.

This study reviews the development of printed circuit technology from its origins before the Second World War until the present day. Various inventions appeared before the war for producing circuits on a flat surface, but it was not until Dr Paul Eisler had the idea of utilising the long established arts of the printing industry that viable methods of production were established. Stimulated by the release of an American official secret of the use of a printed circuit in a proximity fuse, and the first Technical Symposium in 1947, government and industries researched into the best ways of producing planar circuits. Dr Eisler's etched foil method emerged as the most practical technique. The first decade of the technology was spent learning and refining print and etch techniques, during which time printed circuits gradually became accepted by the consumer industry, as well as by industry and government bodies. Most of the major advances were made during the second decade, such as plated‐through hole, multilayer and additive processes. Since then manufacturing technique has been consolidated and refined, affected by the continuing demands of the electronics industry for increasing miniaturisation and packaging densities.

M & T Chemicals have announced the appointment of Mr David Smith as Director of PCB Systems and as a member of the company's Board of Management. Mr Smith, who was formerly Sales and Marketing Director of Lea Ronal (UK) Ltd, has had more than seventeen years experience in the printed circuit industry.

OMI International (GB) have announced that Allan Murray, one of the leading UK technologists in the field of plating through hole systems for the printed circuit industry, has recently joined the Company.

Trace Instruments have announced that Mr Tony Battaglia has been named central regional sales manager.

Robert Linsdell has been appointed Sales Manager by Dynachem, the Warrington‐based manufacturer of specialty chemicals for the printed circuit board industry.