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).
Letter from E. S. Prather discussing the properties and blending process of Caspar Oil compared to Castrol.
| Identifier | ExFiles\Box 32\4\ Scan191 | |
| Date | 26th September 1924 | |
| Telephone 207 B. By/Sg{Arthur F. Sidgreaves - MD}/ H.22.9.24. Office of E.{Mr Elliott - Chief Engineer} S. PRATHER, 42, Emmastraat, The Hague, Holland. 26th September 1924. Rolls-Royce, Ltd., 14-15 Conduit Street, London W.1. England. [Stamp: RECEIVED 29 SEP 1924 M.D.] Dear Sirs, Your reference Sg{Arthur F. Sidgreaves - MD}3/BM/24924. [Stamp: RECEIVED] I thank you for yours of the 24th inst., but fear that you have overlooked a vital point in connection with your decision re Caspar Oil, viz. Castor oil added to mineral oil is quite a different proposition to the blending of Castor oil with mineral oil. The Caspar oil process secures a permanent suspension and without heating the Castor oil. It is my information that Castrol, the English product, in mixing Castor oil with mineral oil secures a so called blend through heating the Castor oil to such a high degree that much of its lubricant quality is destroyed. It is also interesting to note that recent booklets and advertisements of Castrol make no mention of Castor oil. I am enclosing herewith some further particulars concerning Caspar Oil, which have been supplied to me by the company and I am still firmly of the opinion that Caspar Oil deserves more consideration than could be given to various oils that simply contain a percentage of Castor oil, but without having passed through the proper process of blending. If you regard Caspar Oil as a new departure in the manufacture of lubricants and I have read expert opinions confirming this claim, then perhaps you would still find time and have the inclination to test it. Yours very truly, E.{Mr Elliott - Chief Engineer} S. Prather Encl. | ||