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 comparing the properties of bone grey fibre and continental bakelite, recommending its standardisation.
| Identifier | WestWitteringFiles\N\July1925-September1925\ Scan4 | |
| Date | 7th July 1925 guessed | |
| -2- Contd. A considerable number of tests on these various materials has been made, the results of which are detailed below. Though it is a fact that the bone grey fibre is more susceptible to moisture than the continental bakelite, nevertheless in the numerous tests on these two sample materials which have been carried out on the bench and on chassis, this particular feature does not appear to be an objection. From other points of view, e.g. wear, more particularly, the bone grey fibre appears from the tests to have definite advantages; hence standardisation of this material is proposed and subject to no objection being raised a standardisation sheet will be issued and pass/round in the usual manner. A portion of each of the two samples of bone grey material is sent for R's inspection, together with one contact breaker lever (test No.18). The machining properties of the bone grey are reported to be very good. In all cases of the bone grey fibre rubbing blocks, they were found, after test, to be in excellent condition, the material not fraying as do the bakelite blocks. Contd. | ||