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).
Preliminary report comparing Berling F.61 and E.61 type magnetos.
| Identifier | WestWitteringFiles\E\November1920\ Scan75 | |
| Date | 22th November 1920 | |
| P.A.43. Nov. 22nd, 1920. X.3723 - PRELIMINARY REPORT ON BERLING TYPES F.61 & E.61 MAGNETOS. X.1723 In design, these two machines appear to be identical, the only difference being in the size and weight. The F.61 is of slightly larger dimensions, with a weight of 15 lbs. 7 ozs, and the E.61 11 lbs.11 ozs, as compared with the 11 lbs. 11 ozs. of the standard Watford.✓ They are practically enclosed by a light metal covering, which should render them fairly dust and waterproof. The contact breaker appears to be a rather crude construction, consisting of a pivoted block of fibre, in place of the usual bell crank lever, which, when depressed by the cams, forces the contacts apart; the spring closing the contacts having a weak appearance. It is fitted with medium sized cams, but the control lever is riveted to the cam ring, and therefore does not allow of any adjustment. The high tension current is collected in the usual way, a sharp-edged projection of brass on the conductor, conveying it to the distributor, and a rough edge on the body forming the safety gap. The distributor cover is a neat polished moulding, carrying six small carbon brushes, instead of metal segments, the rotating element being an insulating disc, with a brass segment inlaid. This would perhaps have an advantage over the Watford where the segments may not be quite level with the | ||