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).
Performance comparison log for various dynamo models.
| Identifier | ExFiles\Box 60\1\ Scan274 | |
| Date | 19th June 1930 | |
| X.6006 40/50 I.B. MACHINES. 48 Coil High Output Machines (EJB modification) X.6006. PERFORMANCE COMPARISON OF DYNAMOS. (on routine procedure of 1.4.27) Date. | Dynamo. | Particulars and remarks. | (1) | (2) Brush angles. | (3) Temperatures. | Peak | | | | Main. | Control. | Amb. | Rise. | Machine. | Amps. | Speed. ---------------------------------------------------------------------------------------------------------------- 19-6-30 | 1.24S.HO | Made on Prod-n for shop. 48 coil armature with EJB poles. | O.K. | 19.5° | 129.5° | 23.5 | 55.5 | 79 | 16.5 | 1,960 8-7-30 | 2.24S.HO | Made on Prod-n for shop. | O.K. | 21° | 130.5° | 20 | 57.5 | 77.5 | 17.1 | 1,970 26-8-30 | L H.2.M. | Made on Prod-n. | O.K. | - | 127.5° | 29 | 55 | 84 | 17.0 | 1,990 26-9-30 | L H.1.M. | Made on Prod-n. | O.K. | 19.5° | 127.5° | 20 | 57 | 77 | 17.9 | 2,100 6-10-30 | 2.24S.HO | Made on Prod-n. | O.K. | 19.5° | 129° | 17 | 56 | 73 | 16.8 | 1,970 17-10-30 | 3.24S.HO | Machine from Prod-n. Obtained for purposes of Production Test. | O.K. | - | 128.5° | 18.5 | 62 | 80.5 | 16.3 | 1,970 20-10-30 | 4.24S.HO | Machine from Prod-n. Obtained for purposes of Production Test. | O.K. | - | 129° | 17.5 | 58.5 | 76 | 16.1 | 2,000 20-10-30 | 5.24S.HO | Machine from Prod-n. Obtained for purposes of Production Test. | O.K. | - | 129° | 15 | 61.5 | 76.5 | 16.4 | 1,980 21-10-30 | 6.24S.HO | Machine from Prod-n. Obtained for purposes of Production Test. | O.K. | - | 127.5° | 16.5 | 61.5 | 78 | 17.1 | 2,050 22-10-30 | 7.24S.HO | Machine from Prod-n. Obtained for purposes of Production Test. | O.K. | - | 127.5° | 17.5 | 62 | 79.5 | 16.3 | 2,050 23-10-30 | 8.24S.HO | Machine from Prod-n. Obtained for purposes of Production Test. | O.K. | - | 128° | 18 | 60.5 | 78.5 | 16.1 | 1,950 | ||