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 IGNA sparking plugs, detailing various models and prices.
| Identifier | ExFiles\Box 33\3\ Scan128 | |
| Date | 5th May 1921 guessed | |
| IGNA Sparking Plugs "ALWAYS FIRING." Each IGNA model here shown is the outcome of a wide experience in plug design and represents the highest type of modern plug production. REDUCED IN PRICE BUT NOT IN QUALITY Illustrated is the range now listed for the first time at our new REDUCED SCHEDULE OF PRICES. M.1. 'Mica,' single point, Metric thread. PRICE 4/6, including cleaner FREE, which cleans this plug in five seconds. Non-detachable. For high-compression engines. By simply inserting this IGNA Plug Cleaner into the Plug, and giving a few half turns, all sooty deposit is scraped off the insulation. Igna Patent Cleaner. M.3. Mica, three point, Metric thread PRICE 4/6 P.1. Porcelain, single point, Metric. PRICE 4/- P.3. Porcelain, three point, Metric. PRICE 4/- Above are for all English Cars and Motorcycles. Detachable. P.1. A.L.A.M., porcelain, single point, 7/8". A.L.A.M. for American Cars PRICE 4/- F.{Mr Friese} Porcelain, single point, 1/2" taper gas. For Fords, etc. PRICE 4/- B.B. Porcelain, single point. For Amer. Bedford-Buick. PRICE 4/- M.1. Mica, single or three point, Metric. PRICE 5/- (Long Reach) Or long body at same price. H.{Arthur M. Hanbury - Head Complaints} Mica, single point, Metric. For Racing engines. PRICE 6/- R.1. Porcelain, single point, Metric. Non-detachable. PRICE 3/3 R.3. Porcelain, three point, Metric. Non-detachable. PRICE 3/3 R.F. Porcelain Non-detachable plug for Fords PRICE 3/3 TYPE M.1 TYPE M.3. P.1. P.3 F.{Mr Friese} B.B. M.1. LONG REACH. H.{Arthur M. Hanbury - Head Complaints} R.1. R.3. P.1 A.L.A.M. Text on spark plugs: IGNA, PAT. N 135008/19, BRITISH MADE Supplied by UNIVERSAL ENG. CO., 'Phone—Cent. 2108. 71, TEMPLE ROW, BIRMINGHAM. 'Grams—"Mindful," B'ham. | ||