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).
Letter from The Igna Engineering Company Limited regarding their mica sparking plugs.
| Identifier | ExFiles\Box 33\3\ Scan017 | |
| Date | 8th October 1919 | |
| ALL LETTERS TO BE ADDRESSED TO THE COMPANY, NOT TO INDIVIDUALS. WHOLESALE ONLY. TELEPHONE, DUDLEY 2196 TELEGRAMS, "IGNA, DUDLEY." "IGNA" SPARKING PLUGS PATENTEES AND MANUFACTURERS. THE IGNA ENGINEERING COMPANY LIMITED, HIGH STREET, DUDLEY WORCS. YOUR REF. KB/W695 OUR REF. 8th October 1919 Messrs. Rolls-Royce Ltd., Nightingale Road, DERBY. Dear Sirs, The Sparking Plug illustrated above shows our Mica Plug and we shall be pleased to submit you samples for testing purposes on receipt of your written request. We are making it with Single and Three Firing Points and we will be pleased to send samples of the type you desire. If also you will let us know your requirements we can quote you exceptionally favourable terms. This Plug represents the last word in Plug design and is the outcome of years of experience and experiments in Plug manufacture. Owing to the extreme simplicity of construction we embody perfect Gas tightness and high insulating properties. The body is in one solid piece and therefore it is impossible for Gas to leak through solid steel. There are no Gland Nuts or inserted pieces of [Handwritten text at top] X 1872 R/A letter asking for two experimentally By [Handwritten text on right] By [signature] ppy [Handwritten text in middle] H.S. obtain samples for trial & report on it. A.B.M 11.X [Stamped text] 10 OCT 1919 R.A.I RECEIVED | ||