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).
Test report detailing the durability and fracture points of different pivot types under various conditions.
| Identifier | ExFiles\Box 2\12\ B002_X168-page075 | |
| Date | 2nd April 1913 guessed | |
| AW/TSI21/L2413 (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 | 60 | 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. | 60 | 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. | ||