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).
Recommending Ethylene Glycol as an anti-freeze, with a table of proportions and corresponding freezing points.
| Identifier | ExFiles\Box 151\3\ scan0193 | |
| Date | 29th January 1934 | |
| Py/Blb. from Hs{Lord Ernest Hives - Chair}/FD.{Frank Dodd - Bodies} c. to Wor.{Arthur Wormald - General Works Manager} Hs{Lord Ernest Hives - Chair}/FD.{Frank Dodd - Bodies}6/KW.29.1.34. Replying to your memo. Py/Blb.24.1.34, and enquiries regarding anti-freeze mixture. We should recommend Mr. Holloway to use Ethylene Glycol, and below are the figures given by the makers showing the proportion necessary. % of Ethylene Glycol Volume. Freezing Point. °C. 5% -1 °C. 10% -3 " 15% -5 " 20% -8 " 25% -12 " 30% -16 " 35% -21 " 40% -25 " 45% -31 " 50% -37 " We are despatching to you to-day a 1 gallon tin of Ethylene glycol. Hs{Lord Ernest Hives - Chair}/F.Dodd. | ||