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).
Modifications to the New Phantom starter circuit diagram for the instruction book.
| Identifier | ExFiles\Box 64\3\ scan0064 | |
| Date | 3rd February 1926 | |
| TO EFC. FROM AJS. Copy to - BY/RD. BY/MM. [struck through] NEW PHANTOMCodename for PHANTOM I - SEQUENCE STARTER CIRCUIT DIAGRAM. Handwritten: X7650 AJS4/M3.2.26. Handwritten: X7650 Thank you for sending us the revised and improved diagram for the sequence starter. We agree that for this system of connections one diagram should suffice. [Handwritten in margin: Agreed E.F.C.] The diagram sent by you, although extremely clear in the size forwarded, will require some modification in the proportion of the units to enable it to be reduced sufficiently to come within the compass of a once folded sheet in the instruction book, otherwise if reduced from its present size to that requisite for an instruction book diagram, we fear that the connections on the automatic switch will be insufficiently clear and understandable. It appears that the battery, duplex press button switch, and starter motor, could all be reduced in size relative to the remainder considerably, and that the solenoid and main circuit switch could be reduced say half way between these and the automatic switch unit. We realise that this is disturbing the relative proportions of the units to some extent, but we consider this less of an evil than obscuring the clearness of the connections by making them too diminutive. [Handwritten in margin: Agreed E.F.C.] On the final diagram for instruction book the terminals on the thick black conductors should be thicker in outline than the remainder, otherwise we believe the conductors will look disjointed as indicated on the print D.71088. [Handwritten in margin: Agreed E.F.C.] We think that in adding coloured lines to those portions of the automatic auxiliary switch unit indicating contacts, considerable care should be exercised to make it clear which contacts are open, and which closed. [Handwritten in margin: Agreed E.F.C.] To make the diagram uniformly clear we believe it would be better to bring what has, on the print referred to, been designated as the terminal stud at the top of automatic switch unit diagram, on to the junction of the 3 conductors in place of part of the way along the conductor leading to resistance. A similar remark applies to the terminal stud we have recently added in the middle of the automatic switch unit, and further, we think an improvement might be made by replacing what appears to indicate a terminal stud on the earth side of the green circuit, by a feature approximating more nearly to the actual piece indicated on LeC. 2195. in this particular position. We should be very glad if you would let us have in due course, before the incorporation of the aforegoing in the instruction book, a black and white print on which the conductors have been suitably coloured. [Signature] AJS. [Stamp: RECEIVED] | ||