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 General Filters, Inc. detailing the composition of filter cartridges being sent for testing.
| Identifier | ExFiles\Box 174\2\ img103 | |
| Date | 12th April 1937 | |
| GENERAL FILTERS, INC. 9001 Alpine Avenue DETROIT April 12, 1937 Mr. W. Arthur Robotham Experimental Department Rolls Royce, Ltd. Derby, England Dear Sir: We are shipping you today, via parcel post, two General Filters and nine cartridges. Your will find the cartridges numbered on the top 1, 2 and 3. Cartridge number 1 - which we find to be our best filter contains a charcoal cone, five ounces of fine white thread waste and one ounce of cotton linters at the top. Cartridge number 2 - contains a charcoal cone and six ounces of fine white thread waste. Cartridge number 3 - contains six ounces of cotton linters only. You will also find in this shipment two sets of flexible tube connections and five each extra gaskets. We expect to be in production in thirty days on the new screw clamp cover of which we showed you a blue print. we feel that this will make a much more satisfactory filter case and we will forward some of these to you for test, as soon as they are obtainable. We will be glad to hear of any criticism or comment concerning these tests. Sincerely yours, GENERAL FILTERS, INC. A.{Mr Adams} D.{John DeLooze - Company Secretary} Hedner ADR:IS Handwritten notes: Rm{William Robotham - Chief Engineer} We will clear & send the parts to you in due course. yh 23/IV/37 | ||