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 results showing average life before breakage for various bolts and rivets in Dumb Iron.
| Identifier | ExFiles\Box 119\2\ scan0046 | |
| Date | 5th May 1914 | |
| Wor{Arthur Wormald - General Works Manager}/Mcrl/L5514. Sheet. 2 BOLTS & RIVETS ETC. Piece No. Description Time Hrs. Mins. Results Reference. K.315 Vertical Bolt in Dumb Iron off side. 10 - 27 Broke. Wor{Arthur Wormald - General Works Manager}/Hy{Tom Haldenby - Plant Engineer}19/L101113. " ditto. 10 - 32 " Wor{Arthur Wormald - General Works Manager}/Hy{Tom Haldenby - Plant Engineer}5/L201113. " ditto. 4 - 5 " " F4833 Countersunk single vertical bolt in Dumb Iron, near side 17 - 50 Head broke off Wor{Arthur Wormald - General Works Manager}/Hy{Tom Haldenby - Plant Engineer}20/L3314. F4833 Countersunk single vertical bolt in Dumb Iron, off side. 25 - 52 Half head broke off " 3/8" Vertical Rivet in Dumb Iron, near side. 5 - 13 Head pulled off Wor{Arthur Wormald - General Works Manager}/Hy{Tom Haldenby - Plant Engineer}19/L221013. 3/8" vertical Rivet in Dumb Iron, off side 10 - 38 ditto. " Average Life before breakage. K.315 Vertical Bolt in Dumb Iron) near side 3 hrs 7 mins. Average over 11 K.315 ditto. (off side) 8 " 21 " " " 3 F4833 ditto. (near side) 17 " 50 " " " 1 F4833 ditto. (off side) 25 " 52 " " " 1 | ||