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 Boulton & Paul concerning power factor calculations for a wind tunnel installation, correcting a previous oversight.
| Identifier | ExFiles\Box 27a\3\ Scan184 | |
| Date | 13th April 1931 | |
| 84516 139, QUEEN VICTORIA STREET, LONDON, E.C.4. TELEGRAMS: 'BOUTIQUE, CENT, LONDON' TELEPHONE: CENTRAL 4642. 10, BATH ROW, BIRMINGHAM. TELEGRAMS: 'BOUTIQUE, BIRMINGHAM' TELEPHONE: MIDLAND 3381. 8-11, PAVILION BUILDINGS, BRIGHTON. TELEGRAMS: 'BOUTIQUE, BRIGHTON' TELEPHONE: BRIGHTON 3284. SYDNEY, N.S.W. G.P.O. BOX 3799T. TELEGRAMS: 'BOUTIQUE, SYDNEY' JOHANNESBURG. P.O. BOX 904. TELEGRAMS: 'BROSBEL, JOHANNESBURG' TELEPHONE: CENTRAL 7500. BY APPOINTMENT BOULTON & PAUL LIMITED. NORWICH. FOUNDED 1797. CODES: A.B.C. (5TH & 6TH EDITIONS) BENTLEY'S COMPLETE PHRASE CODE BENTLEY'S SECOND PHRASE CODE MARCONI Etc AND PRIVATE TELEGRAMS: 'BOULTON, NORWICH' TELEPHONE: NORWICH 851. DIRECTORS: J.{Mr Johnson W.M.} J.{Mr Johnson W.M.} D.{John DeLooze - Company Secretary} PAUL, CAPT. J.{Mr Johnson W.M.} D.{John DeLooze - Company Secretary} PAUL. W. H.{Arthur M. Hanbury - Head Complaints} FFISKE. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} E.{Mr Elliott - Chief Engineer} FFISKE. S. HOWES. J.{Mr Johnson W.M.} D.{John DeLooze - Company Secretary} NORTH, F.R.Ae.S., Etc. ALL QUOTATIONS SUBJECT TO USUAL STRIKE AND ACCIDENT CLAUSES TO WITHDRAWAL OR ALTERATION WITHOUT NOTICE TO APPROVED QUANTITIES AND SPECIFICATION. ALL COMMUNICATIONS TO BE ADDRESSED TO THE COMPANY AND NOT TO INDIVIDUALS. Our Reference M.8724 Telephone Extension 78 Your Reference Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}2/KT Expl.Dept. Date 13th April,1931. Messrs. Rolls-Royce,Ltd., D E R B Y. For the attention of Mr.W.A.Robotham. Dear Sirs, In reply to your letter of the 8th instant, we regret that when writing to you on the power factor, we overlooked the very vital differences between your proposed installation and the wind channels we had in mind. The figure of .68 x ½ ρ A V³ is a safe one to take for the open jet wind tunnel of the regenerator type, where the air is collected and used over and over again. You, of course, will be exhausting into the open and the best figure you could possibly hope to do with a good fan is 1.25 x ½ ρ A V³, so that a motor of about 70 h.p. is indicated. We are sorry we have put you to the necessity of writing us, but we are at the same time grateful for your having pointed out what was after all rather a stupid oversight on the part of the writer. Yours faithfully, for BOULTON & PAUL, LIMITED. A.{Mr Adams} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} ODGERS. AGO/BC. | ||