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 and dimensions for positive and negative plates.
| Identifier | ExFiles\Box 58\4\ Scan106 | |
| Date | 22th June 1933 guessed | |
| Thickness. Positive 7/64" Negative 3/32" Depth. positive and negative to feet bottom . 5 1/8" to bottom of plate 5" Width of set of plates Positive 1 1/2 in. Negative 1 1/8 in. from feet bottom to top of taper Post the overall dimension is 8 in. 9 Plate Vagenitte Positive plate are fitted with arches. Width 5 5/16" Thickness 3/16" Depth from top of plate to end of feet 5 in. to top of archs 4 1/4 in to bottom of plates 4 3/8 in P.T.O. | ||