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).
Specification sheet for G.A. high tension waterproof magnetos, detailing features, types, and dimensions.
| Identifier | ExFiles\Box 4\5\ 05-page096 | |
| Date | 17th November 1920 guessed | |
| PAGE 1 SPECIAL FEATURES of the G.{Mr Griffiths - Chief Accountant / Mr Gnapp} A.{Mr Adams} High tension Waterproof Magnetos Design. Silent running. Ease of maintenance. Maximum efficiency. Ease of dismantling & repair. Rotation both ways. All types of G.{Mr Griffiths - Chief Accountant / Mr Gnapp} A.{Mr Adams} Magnetos are fitted with : (a) an indicator showing, at any moment, the next cylinder to fire. (b) an automatic timing device. N. B. — The attention of manufacturers is drawn to the fact that by a simple adjustment the armature of any of the G.{Mr Griffiths - Chief Accountant / Mr Gnapp} A.{Mr Adams} Magnetos may be made to revolve in either a clockwise or an anticlockwise direction. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} A.{Mr Adams} Magnetos :: Electric lighting :: JARNAC Carburetters :: Arecal :: Refrigerators :: Foot warmer :: Pumps :: Sheet-iron. PAGE 2 TYPES of the new G.{Mr Griffiths - Chief Accountant / Mr Gnapp} A.{Mr Adams} High Tension 4 & 6 Cylinders Magnetos 4 cyl. Magnetos to be driven at engine speed. 6 cyl. Magnetos to be driven at speed 1 1/2 times greater than engine speed Type G S suitable for engines up to 60 m/m bore. Type GR{George Ratcliffe} suitable for engines up to 80 m/m bore. Type HS{Lord Ernest Hives - Chair} suitable for engines up to 100 m/m bore. Type HR suitable for engines up to 120 m/m bore. The figures following the letters indicating type of Magneto show number of Cylinders. MEASUREMENTS IN MILLIMETERS DIMENSIONS IN MILLIMETERS Type | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R GS4 | 142 | 127 | 15 | 35,5 | 42 | 6,5 | 23,5 | 12 | 176 | 62 | 43,5 | 91 | 75 | 77 | 61 | 58 | 10 | pas 1,5 GR{George Ratcliffe}4 | 143 | 136 | 17 | 33,5 | 43 | 7,75 | 24 | 12 | 188,5 | 55 | 43,5 | 91 | 75 | 77 | 61 | 58 | 10 | pas 1,5 HS{Lord Ernest Hives - Chair}4 | 155,5 | 146,5 | 15 | 35,5 | 35,5 | 11,85 | 33 | 13,5 | 202 | 50 | 64 | 98 | 50 | 80 | 82 | 61 | 45 | 10 | pas 1,5 HR4 | 171 | 168 | 15 | 35,5 | 35,5 | 11,85 | 33 | 16,5 | 202 | 50 | 64 | 110 | 50 | 80 | 84 | 61 | 45 | 10 | pas 1,5 HS{Lord Ernest Hives - Chair}6 | 171 | 168 | 17 | 35,5 | 35,5 | 11,85 | 33 | 16,5 | 205 | 50 | 67 | 110 | 50 | 80 | 82 | 61 | 45 | 10 | pas 1,5 HR6 | 171 | 168 | 17 | 35,5 | 35,5 | 11,85 | 33 | 16,5 | 205 | 50 | 67 | 110 | 50 | 80 | 84 | 61 | 45 | 10 | pas 1,5 | ||