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 on the wear characteristics of Spaulding's bone grey fibre material used for contact breaker lever rubbing blocks.
| Identifier | ExFiles\Box 69\1\ scan0402 | |
| Date | 24th September 1926 | |
| RR 238 (150 BKS.) (SH57.29-6-20.) MP 224358 X 4646 ROLLS-ROYCE LTD. INSTRUCTIONS. To E.Y.B. Order No. WB{Mr Brazier/Mr Bell}105 Customer's No. X 4646 Date 24-9-1926 Spaulding's bone grey fibre We have now completed two running tests of this material made into contact breaker lever rubbing blocks. The first consisted of a 10000 mls bench test and the other a test under chassis conditions on 12EX in France. The average wear in the first case was .025 inches and in second instance .038". The latter was for a chassis mileage of 18,580 mls and considered proportionately for 10000 mls this works out .021". This wear is more than 300% more than that obtained with the material now standardized, the Signed contd This Sheet must be filed on completion of the work. | ||