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).
Laboratory test result on the foaming of various oils for use in shock absorbers.
| Identifier | ExFiles\Box 28\1\ Scan118 | |
| Date | 6th January 1928 | |
| R.R.A.794m 1m.11-26 55509 RESULT OF LABORATORY TEST ROLLS-ROYCE OF AMERICA, INC. Test No. Date January 6th, 1928. Oils Sheet #1 Foaming of Oils considered for use in Shock Absorbers. About a 300 cc sample of each oil was beaten vigorously by a specially contrived paddle. The stirring was done by the fatest speed available on a drilling machine. Oils Used. First Indications. 5 min stirring 15 min. stirring Final Appearance Foam lasted Mobiloil E Few bubbles formed in 1/2 minute foam gathered around edge for 1/4" Amount of foam decreased about 1/2 Foam 1/8" thick all over about 5 min. 80% Mobile E Larger bubbles formed than with Foam about 1/8" Almost stopped foaming 1/8" thick over all about 23 min. 20% Glycerine E in 1/2 min. Lovejoy Fairly large bubbles formed at once Foam about 1/8" Increased to 1/4" wide Thin foam covering 1/2" surface About 7 min. Mobile Arctic Very large bubbles formed at once Foam increased considerably Foams very badly Heavy Foam About 12 min. Velvoline Lt. Few fine bubbles formed in 1/2 min. Foam about 1/8" No increase Slight foam About 5 min. Lard Oil Few fine bubbles after 1 minute Few bubbles slight increase Thin layer of very fine bubbles About 4 min. Castor Oil Few fine bubbles after 2 minutes Very fine bubbles but not at edge Fine foam increased White turbid solution cleared in 1-1/2 hrs 90% Castor Oil Few fine bubbles after 2 minutes Quite a few fine bubbles Much less # of bubbles Clear solution -few bubbles 10 minutes 10% denatured alcohol | ||