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).
Specification table detailing the required gaps for a relay unit in various operational positions.
| Identifier | ExFiles\Box 64\3\ scan0225 | |
| Date | 15th June 1926 | |
| (2) BY/RD5/ML15.6.26. Cont'd.{John DeLooze - Company Secretary} RELAY UNIT. Position. Gap on upper contact. Gap between pole core & armature. Gap on lower contact. Gap at carbon contacts. Off. 0 .042+8 -6 .053+10 -5 -.040+10 (Depression) Carbons Just making. .018"+5 -3 .025+10 .021+15 0 On. .030+5 -3 .012+3 0 .027+20 This will enable the job to go ahead and in the meantime we will correct the two parts concerned. When you have a switch complete on moulded base, will you please inform us that we may be able to try on the sample cover in wood that we have had made. BY/RD. | ||