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).
Comparison of Ley's 'Black Heart' malleable iron castings against British Standards Institution specifications.
| Identifier | ExFiles\Box 142\4\ scan0118 | |
| Date | 25th January 1940 guessed | |
| File 1202. COMPARISONS SHOWING HOW LEY'S "BLACK HEART" EXCEEDS THE BRITISH STANDARDS INSTITUTION SPECIFICATIONS FOR MALLEABLE IRON CASTINGS LEY'S "BLACK HEART" MALLEABLE Average Tests B. S. I. SPECIFICATIONS 309-1927 White Heart Malleable 310-1927 Black Heart Malleable Handwritten: Lepaz 1300, Lepaz 85 TENSILE per sq. inch Ley's: 24 Tons (Handwritten: 30) B.S.I White Heart: 20 Tons (Handwritten: 35) B.S.I Black Heart: 20 Tons ELONGATION (in 2") Ley's: 18% (Handwritten: 10%) B.S.I White Heart: 5% (Handwritten: 6%) B.S.I Black Heart: 7½% BEND (Cold) Bar ½" thick round 1" radius Ley's: 180° B.S.I White Heart: 45° B.S.I Black Heart: 90° YIELD POINT per sq. inch Ley's: 16 Tons (Handwritten: 18 tons) B.S.I White Heart: Not Specified (Handwritten: 20 tons) B.S.I Black Heart: Not Specified MACHINABILITY Feet per minute Ley's: 180 B.S.I White Heart: 90 B.S.I Black Heart: 90 Handwritten: Min 70/- Cwt (approx 3/6 per casting) Ley's "Black Heart" is 100% British. Handwritten: Delivery 12-14 weeks. | ||