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 Ransome & Marles Bearing Co. comparing their products with 'New Departure' bearings.
| Identifier | ExFiles\Box 114\2\ scan0142 | |
| Date | 2nd May 1935 | |
| x3807 London Office: 17, VICTORIA STREET, WESTMINSTER, S. W. 1. Telephone: VICTORIA 4278-4279 Telegrams: OFFIISLUNDA, SOWEST, LONDON Contractors to H.M. Admiralty, War Office, Air Ministry, Colonial Offices &c. RANSOME & MARLES BEARING Co., LTD., MANUFACTURERS of BALL & ROLLER BEARINGS NEWARK ON TRENT. Branch Offices: LONDON, BIRMINGHAM, MANCHESTER, LEEDS, NOTTINGHAM AND Telegraphic Address: "BEARINGS, NEWARK" Telegraphic Code: BENTLEY'S Telephone Nos: NEWARK 456-457-458 Branch Offices: SHEFFIELD, BRISTOL, GLASGOW, NEWCASTLE, DUBLIN, BELFAST. Our Ref. Tech.Dept.FOH/EMB. Your Ref. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}7/KW. S. Grylls, Esq., Messrs. Rolls Royce Ltd., Experimental Department, D E R B Y. 2nd May, 1935. My Dear Grylls, With reference to the high capacity New Departure bearings, I have now had an opportunity of looking this up, the following being my comments. NEW DEPARTURE 3211: The overall dimensions of this bearing according to my information are 55 x 100 x 21 mm, this being equivalent to our standard LJ.55. The New Departure bearing contains eleven balls 1/2" diameter whereas our bearing contains eleven balls 17/32" diameter, and from this you will appreciate that our bearing has a better capacity than the New Departure, and taking a theoretical consideration at 3,000 r.p.m., the New Departure will have a capacity of 710 lbs., whereas ours will have 790 lbs. NO. 3308: The dimensions of this bearing are 40 x 90 x 23 mm and is equivalent to our MJ.40, the New Departure containing eight 19/32" balls and our bearing containing nine 17/32" balls. From this you will note that while we have one more ball than the New Departure, the size is smaller, which somewhat balances up matters, although here again taking a theoretical consideration from their basic capacity, the New Departure bearing [Handwritten note in left margin:] HOFF. ISS. 11 1/2" BALLS | ||