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).
Continuation page of a test report detailing the results of pivot durability tests.
| Identifier | ExFiles\Box 2\B002_X168\ 00000001-page075 | |
| Date | 2nd April 1913 guessed | |
| AW/TEH/12413 (contd) -2- | Test No. | Type of pivot | Time in mins. start to crack | Time in mins. broken off | Conditions | Remarks. | |---|---|---|---|---|---| | 5 | old type snapped | | 43 | straight cross tube | Good fracture | | 6 | old type | 30 | 55 | As above | This was a new pivot never been on road. We tested this because of variation in time taken to break pivots, which we thought might be due to mileage they had done | | 7 | present type | 50 | 400 | as above | A slight crack started on the knife edge section of metal but did not get any worse until it had been on 300 mins. | | 8 | present type | 150 | 252 | as above | same fracture as test No.7 | | 9 | old type snapped | | 44 | old type cross steering tube with 1.5° bend | Good fracture | | 10 | old type snapped | | 43 | straight cross tube with spring buffer 500 lbs springs | Good fracture | | 11 | do. | do | 14 | do | signs of an old crack. | | 12 | do | 9 | 43 | do | Good fracture | | 13 | do | 25 | 43 | do | do | | 14 | do snapped | | 55 | with rubber buffers in place of springs | do | | 15 | present type | 180 | 390 | spring buffers as No.10 | do. | | ||