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 The Packless Gland Co. Ltd. correcting previous data regarding their No. 2 bellows.
| Identifier | ExFiles\Box 4\1\ 01-page051 | |
| Date | 24th April 1934 | |
| E/H.{Arthur M. Hanbury - Head Complaints} Pearson Telephone: SUNBURY 406. Codes: BENTLEY'S, WESTERN UNION. Telegrams & Cables: PACKLESS, SUNBURY COMMON. THE PACKLESS GLAND CO. LTD. MAKERS OF THERMOFLEX Bellows and Shaft Seals. THERMOFLEX WORKS. Windmill Road, Sunbury, Middlesex. DIRECTORS: M.{Mr Moon / Mr Moore} PAYNE. W.A. PAYNE. W.F.F. MARTIN-HURST. W.M.H/GH: Your Ref: Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}2/KW: April 24th, 1934. Messrs. Rolls-Royce Limited. DERBY. Dear Sirs, We must apologise for the delay in dealing with your letter of April 14th. We are afraid that in our letter of April 4th we made a mistake in stating that the rate of our No.2 bellows is approximately 96 lbs. per inch. This is due to a typographical error. The figures we gave you in our letter of Feb. 22nd, where we stated that the load to compress 3/16" equalled 7 1/2 to 8 lbs. were correct. Even allowing for this mistake, the statements which we made in our letter of April 4th, are still correct. The mean area of our No.2 bellows is approximately .27 sq.in. The vapour pressure of ethyl alcohol at 15°C. is approximately 12 lbs/sq.in. and at 75°C. - 2 lbs/sq.in. The change in pressure from 15°C. to 75°C. is therefore 10 lbs sq.in. Working on a mean area of .27 sq.inches, this gives a load of 2.7 lbs. which is insufficient to compress the bellows through the distance of .125" which you specify. We agree with you that if a fluid is employed which over this range of temperature gives a greater change of pressure, the pressure at 100°C. would probably be ex- | ||