Report prepared by G.A. Chadwick of the Electronic Control Engineering Department of Associated Electrical Industries Limited concerning 'A Coarse Amplifier for a Large R.P.C. System'. The main purpose of the report is to 'develop a braking circuit which will bring the mounting to rest from any velocity, ideally without overshoot'. Report entitled 'A Coarse Amplifier For A large R.P.C. System - Memo J. 47'