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).
Warning and procedure for ordering the correct replacement belt using 'Angle Cards'.
| Identifier | ExFiles\Box 135\1\ scan0099 | |
| Date | 9th December 1937 guessed | |
| Page 3 WARNING Do not attempt to place on the machine assembly a belt that has the same angle as the sheave angle or the same top width as the sheave top width. This belt would be from 4 to 12 degrees wrong in angle and much too narrow to give satisfactory service. Send to the factory the correct "Angle Card" with all of the above information on it and we will specify the correct replacement belt. We are enclosing five sets of "Angle Cards" and a card correctly filled out is illustrated below. Additional cards can be obtained from the factory. [Illustration 1] 1937 Mack Truck Model BD{Mr Berend} Old Belt 46 1/2 DC 36° Top Width [Illustration 2] Take-up Slot 4" Take-up 1/3 Gone With Old Belt Fan Pulley 6" OD Gilmer Belt No. 5714 Cordially yours, BARNEY SNAPP | ||