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).
Table detailing measurements and tolerances for radiator matrix tubes across various production batches.
| Identifier | ExFiles\Box 15\1\ Scan389 | |
| Date | 30th January 1931 | |
| E 79448 RADIATOR MATRIX TUBES BATCH N° / MAX. OVERSIZE IN BORE / OVALNESS / VARIATION IN BORE 21 / +.0025 / .002 / .001 27 / +.0025 / .0025 / .001 29 / +.0015 / .002 / .001 34 / +.0012 / .002 / .001 42 / +.001 / .002 / .0015 44 / +.0015 / .002 / .0015 800 / +.001 / .002 / .0015 838 / +.0022 / .002 / .0015 843 / +.0015 / .0025 / .0015 932 / +.0015 / .002 / .0015 945 / +.0025 / .0035 - .004 / .0015 946 / +.0015 / .002 / .001 951 / +.0025 / .0025 / .001 NOTE SECTION THICKNESS OF TUBES IN ALL CASES ARE CORRECT. TEST ROOM 30 JAN 31 DERBY | ||