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).
Improving the visibility of directional arrows on the hand pump unit for Phantom III Hydraulic Jacks.
| Identifier | ExFiles\Box 139\1\ scan0135 | |
| Date | 7th May 1936 | |
| X1166 [Signature] Rm{William Robotham - Chief Engineer} BY.{R.W. Bailey - Chief Engineer} C. Hs.{Lord Ernest Hives - Chair} Slt. Mx.{John H Maddocks - Chief Proving Officer} E/Lid.{A. J. Lidsey}1/HP.7.5.36. P.III Hydraulic Jacks. In connection with the controls for the above we consider that the arrows indicating the direction of rotation of the three valves on the hand pump unit are not sufficiently clear, the heads and tails appearing too much alike when the handles are dirty and viewed in a poor light. In order to improve this point on the pump units already delivered we think the tails of the arrows should be filled in with black enamel, and we should be glad if you will instruct this to be done. We are writing to Donald Sessions & Co.Ltd. and asking them to modify all future pumps by deleting the tails of the arrows and increasing the size of the arrow heads. E/Lid.{A. J. Lidsey} | ||