Patent by Frederick Lanchester and Lanchester's Laboratories Limited for improvements in armatures of electro-motors and generators, 04 Jan 1926
Alternative reference number
04 Jan 1926
Gramme or ring type of armature, which can withstand speeds of 18000 to 20000 feet per second (f.p.s.) compared with the usual 3000 or 4000 f.p.s. Refers also to the bearings of the armature, and links to the commutator.