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).
Material standard sheet detailing physical properties, surface requirements, and size variations for wire.
| Identifier | ExFiles\Box 158\4\ scan0062 | |
| Date | 28th September 1936 guessed | |
| Sheet #2 Material Standard C. S. V.{VIENNA} 2 4. PHYSICAL PROPERTIES: - (Continued) C H A R T (Continued) #9 5/32 #8 #7 Size .148 .156 .162 .177 Reverse Twist 17 16 15 14 Using 15" specimen. 3/16 #6 #5 7/32 #4 #3 1/4 #2 Size .187 .192 .207 .218 .225 .244 .250 .263 Reverse Twist 20 19 18 17 16 15 15 14 Other sizes can be calculated from formula - N = 20 L / 81 d N - Number of turns L - Length of wire in inches d - Wire diameter in inches. 5. SURFACE: - Upon etching with a boiling solution of 30% Hydrochloric Acid for fifteen minutes no seams, hair line or otherwise, pits, gouges, die marks or other surface imperfections shall be revealed, even though the wire has been twisted. 6. SIZE VARIATION LIMITS: - Sizes 3/16" or over - plus or minus .002 Sizes .177 - .091" - plus or minus .0015 Sizes less .091" - plus or minus .001 If special tolerances are specified on purchase order they shall supersede this table. 7. BUNDLE SIZE: - Bundle size as specified on purchase order. | ||