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).
Drawing of an induction pipe for a 30 HP T.T. car, showing multiple views and dimensions.
| Identifier | ExFiles\Box 31\4\ Scan128 | |
| Date | 12th December 1931 guessed | |
| Ex7188, FOR 30 H.P. T.T. CAR / EX. 7188, ALLOYED IRON, INDUCTION PIPE - ONE ON CAR ONLY, 3.500, 5.500, 3.250, 5792, RETURN TUBE, 3.000, STEEL SHRUNK TO TUBE, ELBOW, ADAPTED TO Ex.CAR, EQUAL | ||