APPENDIX 5ll 
50 — Serre ree TR ec AA A 
40 4 ! —2F. ! = i i 
30° : es 
Ais ern eae ae rao 
Ficure 8. Signal records. (F) August 25, 1944, dip in record coincides with low mist. (G) August 14, 1944, shows effect of low fog. 
(H) January 15, 1944, typical for widespread, thick fog. 
TIME IN HOURS GMT——> 
Ficure 9. Signal record. August 26 to 27, 1944, showing examples of interference fading 
in radiation nights. 
TABLE 1 
Forecasting No. of cases % of correct 
system examined forecasts 
(de/dh) term 600 56 
Continuity method 600 57 
(dT /dh) term 150 75 
