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).
Instructions for a spark test on 'Elo' and 'Bakelite' to assess carbonisation from surface sparking.
| Identifier | ExFiles\Box 39\3\ Scan137 | |
| Date | 4th August 1921 | |
| RR 238 (300 Bks.) (SF 152. 6-11-18.) MP 197880 X. 3513. ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: EFC Date: 4 Aug 1921 Order No: A13.15 Customer's No: 1 X 3513. Spark Test of Elo and Bakelite. The piece of 'Elo' received from Mr Bailey under By 5-PY-Y-21 has now been tested for carbonisation due to surface sparking. A very severe spark was first tried, by using an R.{Sir Henry Royce} Bosch magneto with a small single mica plate condenser across the gap, the spark being passed across the edge of the sample which is just 10 mm wide. A few minutes of this caused a carbon track to form (contd) This Sheet must be filed on completion of the work. | ||