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. | ||
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).