Coast artillery drills. Vol. II : Drill for equipments radar : C.A. no. 1 Marks 2* and 3* radio equipment C.B. 4553 (1) (R) Auto-aligning System Mark 2. (A/AL. MK.2) : alignment of plan displays with associated radar aerials, Volume 1. Technical Description, 1951 radio equipment C.B. 4553 (2) (R) Auto-aligning system mark 2. (A/AL. MK.2) : alignment of plan displays with associated radar aerials, Volume 2. Figures