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).
Advertisement for the 'Over All' or 'O.A.P.' two-piece detachable sparking plug.
| Identifier | ExFiles\Box 33\3\ Scan122 | |
| Date | 16th March 1921 guessed | |
| Get the best type of spark plug for your car - Ask your dealer to supply you with the “Over All,, Sparking Plug THE O.A.P. PLUG The one which gives security for high power and high compression motors. No possibility of fracture - No points. Burning or red hot points completely avoided. Made in two detachable pieces only. No nuts or locking nuts whatever to keep the two pieces together - No packing. Can be taken into pieces in one second for cleaning. Does not require any tool or skill or knowledge to be detached and assembled again. The only one in the world which pieces can be replaced with spare ones. [Red Stamp Text] Sole concessionaire for the British Isles and Colonies L.A.P.O.N. 7, King Street, Cheapside LONDON | ||