The folder contains correspondence between D W Alford and colleagues at Ferranti Aircraft Equipment Department, Bracknell, relating to the continued development of six prototype oscillogyros, reports from Ferranti Defence Systems Ltd, Edinburgh, relating to the BAIN contract and further testing of six first stage prototype oscillogyros. D W Alford provided support as a consultant on the project from 1 March 1969.

D W Alford has written explanatory notes to the folder on its front cover.