From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Road test report comparing the efficiency of 'Halo' and 'Ferodo' brake linings when cold and hot.
| Identifier | ExFiles\Box 26\4\ Scan204 | |
| Date | 18th December 1923 | |
| M 20 (10M BKS) (SK 168 6-10-22) MP 160799 X4388 ROLLS-ROYCE LTD. INSTRUCTIONS To: Mr. Hives 18/12/1923 Order No. Customer's No. Re "Halo" Brake Linings Road Tests on 7 J.II. fitted with above on footbrake, showing efficiency in pulling up car (a) cold, (b) heated up. Ferodo on 3 J.II compared under like conditions. Speed at braking point = 30 m.p.h Halo | Ferodo Time | Distance | Time | Distance Cold | 4 4/5 sec | 86' 10" | 4 sec | 78' 3" Hot | 12 2/5" | 246' 6" | 6" | 111' 6" Average of 4 readings. Signed: L.W. This Sheet must be filed on completion of the work. | ||