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).
Extract from the Morganite & Battersea Carbon Brush List detailing specifications for Copper Morganite Brushes.
| Identifier | ExFiles\Box 35\1\ scan 011 | |
| Date | 26th May 1919 guessed | |
| X 2656. Extract from the Morganite & Battersea Carbon Brush List. COPPER MORGANITE BRUSHES. These combine the high conducting properties of Copper Gauze with the well known lubricating properties of Morganite Brushes. These brushes can be adapted to any conditions by suitably proportioning the metal content. For bronze slip rings of special composition brushes can be supplied to give the maximum conductivity with the minimum wear. | Quality. | Spec. Res. Ohms. per in. cub. | Coeff. of friction. | Contact drop at normal current density. Volt. | Normal current density. comm. | Normal current density. Slip rings. | Sphere of use. | |---|---|---|---|---|---|---| | C M.{Mr Moon / Mr Moore} | .000007 | .20 | .26 | 100 | 150 | For ordinary bronze slip rings when the current density is high & D.C. machines up to about 10 volts | | C.M.1 | .000018 | .19 | .27 | 90 | 130 | Link CM 1 is a bronze type of brush designed for much the same duty as Link CM. | | C.M.6 | .000090 | .19 | .45 | 65 | 90 | Though metallic this brush has a highly graphitic running surface. Recommended for Induction Motor Rings. | | C.M.9 | .000500 | .18 | .68 | 50 | 70 | This brush contains a smaller proportion of copper, and is used successfully on slip rings and D.C. machines up to 100 volts. | | ||