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).
Specifications for a machine with aluminium end-plates, detailing its components.
| Identifier | ExFiles\Box 34\2\ Scan050 | |
| Date | 6th November 1918 | |
| RR. 238 (300 Bks.) (SF 152. 6-11-18.) MP 197880 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To Order No Customer's No. Z. 19 The particulars of this machine which has aluminium end-plates are as follows. Armature. Dia 1.39". Active Length 1.15". Slots 10. Resistance 8.37w. Weight 12.5 ozs. Commutator. Dia. 1.043". Length .323". Segments 10. Brushes. Rolled copper gauge, Section .0131-.0314". Magnet. Mean length 8.3". Mean span 2.1". Bar width 1.0". Bar thickness .35". Section .35 sq". Tunnel dia. 1.4025". Magnetic circuit. Mean length 8.8". Air gaps .00625" each (Tot .0125"). Weight. Complete machine 3lb 8 ozs. (cont'd) Signed This Sheet must be filed on completion of the work. | ||