x

X, 1. it doesn’t mean this didn’t RS, it doesn’t mean this didn’t RR, it means this does not produce any reaction of any kind on the meter. (SH Spec 255, 6304C04) 2. didn’t read. (HCOB 29 Apr 69) 3. experimental. (SH Spec 235, 6302C07)

X1, code number of a process. (BTB 20 Aug 71R II)

X2, code number of a process. (BTB 20 Aug 71R II)

X UNIT, in 1962 a Saint Hill Special Briefing Course unit with theory covering everything relative to R2-12, data on mid ruds, tiger drilling and big tiger. Practical was all R2-12 practical, any drills omitted in W unit, tiger drilling and big tiger. (HCO PL 8 Dec 62)