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).
Table of armature windings and technical specifications for various dynamos.
| Identifier | ExFiles\Box 68\4\ scan0197 | |
| Date | 29th September 1919 | |
| -2- 29.9.19. TABLE OF ARMATURE WINDINGS( DYNAMOS) Contd. | Machine. | C.A.V.N.G.R.R. | Lucas E.575. | Smith T & M.A. | Bliur. | Liberty. | R.R. 20 HP | Lucas A.400. | Smith T & M 3A | |---|---|---|---|---|---|---|---|---| | Armature dimensions. | 3½" x 2½" | 3.575"x2.600" | 3 3/16" x 3 11/16" | 3.6"x2.85 | 2 9/32 x 2¼" | 2.750 x 1.850 | 4.50"x 3.15" | 3 3/16 x 2½" | | Com. dimensions. | 1.90"x.78" | 2.0 x 1.650" | 2.0" x 1.0" | 2.0"x.95 | 1 5/16"x 9/16 | 2.050 x .750 | 2.00"x.925" | 1.81x1.0" | | Brush contact area. | 1x .60"x.25" = .150 sq." | 2x .625x.30" = .375 sq." | 1x.75x.375 = .281 sq." | 1x.75x.275 = .206sq." | 1 x .35 x .25 = .088 sq | | 1x.75"x.5" =.375sq." | 1x.75"x .375 | | Armature resistance. | .46 ω | .44 ω | .685 ω | .435 ω | .404 ω | | .409 ω | .618 ω | | Air Gap. | | | | | | | | | Faint text on right edge: R.R. & B. LTD FOR S.W. DEPT. ONLY | ||