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announced. Directors are Air Commodore C. S. Cadell, C.B.E., M.A., A.M.I.E.E., Managing Director Trade Announcements I.A.L., London, Mr Albert Lowe and Mr P. M. Beechenow. Mr Lowe is the I.A.L. Far East Representative. He A monthly feature giving news of recent Government and professional appointments, is Managing Director of the new company. Mr industrial developments and business changes, etc. Beechenow, a solicitor, is resident in Karachi. The first company meeting, in Karachi, on Novem B.E.A.C. Chief Executive Officer Richard Fairey continues as Chairman and Managing ber 3, 1949, was attended by Commander K. Kemble, It is announced by the Chairman of British Europ Director. R.N.V.R., I.A.L. Commercial Manager, who is Air ean Airways, Lord Douglas of Kirtleside, that the Mr Geoffrey William Hall, A.F.R.Ae.S., M.S.A.E., Commodore Cadell's alternate on the Board. Minister of Civil Aviation has approved the appoint has been appointed a Director. He will be in charge Activities of the new company include a large ment of Mr Peter Masefield, as Chief Executive of of the Company's Research and Armament Develop technical training task on behalf of the Pakistan British European Airways Corporation, of Dorland ment Division. Government. House, Lower Regent Street, S.W.I. Mr H. A. Adams, A.C.A. Chief Accountant of Mr Masefield joined B.E.A. in January of this year, Fairey's Activities at Ringway International Aeradio Limited is now combining first as Assistant to the Chairman, later as Deputy The Fairey Aviation Company, of 24 Bruton Street, accountancy duties with the post of Secretary of the Chief Executive. For the past few months, since the W.1—in co-operation with the de Havilland Aircraft Company. resignation of Mr J. V. Wood, he has performed the Company—has completed the overhaul, modification As a result of reorganization Mr D. N. Locke, duties of Chief Executive. and flight testing of 45 Mosquito Mk. 19 night fighters formerly Staff Superintendent, has been appointed which are going to the Swedish Royal Air Force. Senior Administration Officer. B.S.A. Appointments The work has been undertaken at Ringway Air As from November 28 International Aeradio Mr T. E. Parkinson has, from the beginning of port, near Manchester, which is the flight test and Limited Head Office will be installed in their recently- November, been appointed Manager of the London servicing centre for the Company's main Northern acquired Aeradio House, 40 Park Street, London, W.1. Headquarters of the B.S.A. Tools Group. He will be Factory at Heaton Chapel, Stockport. It follows Telephone (REGent 5024) and cable address responsible for the Machine and Small Tool activities similar contracts for conversion and overhaul of 132 (Intaerio, Audley, London) remain as before. of B.S.A. Tools Group in London and the Southern Mosquito aircraft for Turkey and 5 for the Dominican Area. For a number of years Mr Parkinson was Small Republic. Kayser, Ellison's Loss Tools Manager of A. A. Jones & Shipman Ltd., of Recently, Fairey test pilots at Ringway also checked We regret to announce the death after a long illness Leicester, and served the Machine Tool Trades out the last of 124 'Air Lift' York transports, which on October 15, 1949, of Mr C. H. Arnold, Commercial Association during the illness of the Secretary. Until the Company has overhauled for the Royal Air Director of Kayser, Ellison & Co. Ltd., Carlisle. recently, he was Secretary of the Council of Iron- Force. This represents the largest contract of its kind foundry Associations and of the Joint Iron Council. He had been in the service of the company for awarded to a civil repair and maintenance organiza He has resigned from these engagements to take up 41 years, and was appointed to the Board in 1945. tion. his new position with B.S.A. Tools Group, of Macka- Mechanical Handling Equipment down Lane, Marston Green, Birmingham. New Director of Glosters An agreement to manufacture each other's products Mr R. N. Foyer has been appointed Continental The Hawker Siddeley Group Ltd., of 18 St James's has just been signed between one of the leading Representative for the B.S.A. Tools Ltd. and the Square, W.1, announces that Mr E. W. Shambrook, British manufacturers of mechanical handling equip Index Automatic Machine Co. Ltd. He will be F.C.I.S., has been appointed to the Board of Gloster ment, J. Collis & Sons Ltd., of Regent Square, responsible for liaison between these companies and Aircraft Co. Ltd. He joined the company as assistant Gray's Inn Road, W.C.I, and an important Michigan their overseas agents and clients. Mr Foyer was for secretary in 1935, having previously served with Peat, firm, the Lake Shore Engineering Company. many years engaged in the London activities of Marwick, Mitchell & Co., Chartered Accountants of As a result, the Collis Truck, the Collis Stacker, Alfred Herbert Ltd., and until recently was Sales London. He was appointed secretary in 1940 and two the MotaVeyor and the RolaVeyor, well known Manager of Deloro Stellite Ltd. years later became secretary of the associate company, throughout British industry, will soon also be manu A. W. Hawksley Ltd., at that time engaged in aircraft Fairey Board Appointments factured in America and sold throughout the U.S.A. production, rejoining Gloster Aircraft in the same The Board of Directors of the Fairey Aviation and Canada. capacity in 1944. Company Ltd., of 24 Bruton Street, W.1, announces J. Collis & Sons Ltd., the makers of this equipment, that at its Meeting on October 20, 1949, Mr Roland will in turn manufacture over here, in addition to their International Aeradio Limited Thomas Outen, a Director of the Company for nearly own products, American designed conveyors, auto The formation of International Aeradio (Pakistan) seven years, was appointed Deputy Chairman. Sir matic conveyors and locomotive coalers. Limited with headquarters in Karachi has been formula which takes account of diameter, pitch and length of engagement. This follows the practice intro Unified Screw Threads duced by the B.S.I. in the 1940 edition of B.S. 84 for Whitworth form threads. A new principle is however A Provisional British Standard, issued for Comment by introduced in that in the Unified system the tolerance on the nut in each of the three classes is approximately THE BRITISH STANDARDS INSTITUTION, 28 Victoria Street, London, S.W.I 30 per cent greater than the tolerance on the screw. Explanations are included regarding the various B.S. No. 1580: 1949.—Unified Screw Threads. years, an extensive research on screw thread form has formulae and on the relationship between the effec In December last the Technical Press announced been conducted at the National Physical Laboratory. tive diameter tolerances and pitch and angle errors. the signing of a Declaration of Accord in Washington This research has shown that within broad limits the The tables of tolerances for special threads are between Great Britain, the U.S.A. and Canada re angle of a thread is not a feature of major significance compiled in a similar manner to those in B.S. 84 for garding an agreement between these three countries on in respect of strength. In general, the Unified form is Whitworth form threads and provide for a variety of a Unified Screw Thread system. This agreement repre somewhat stronger than the Whitworth form, though pitches on all diameters from ¼ in. to 20 in. To assist sented the culmination of discussions extending back the difference is only marked in the case of cold rolled designers, and to facilitate the economic production over thirty years, and resolved differences in screw threads. Other investigations at the National Physical of both work and gauges for special threads, a sched thread design which have existed for close upon a Laboratory have shown that with bolts and nuts made ule of preferred diameters and pitches is included, and century. to normal commercial tolerances, hand assembly may the threads in this scries are designated UNS. be anticipated between Whitworth nuts and Unified Since December last the final technical details have The standard includes recommendations as to the bolts, and vice versa, up to about ½ in. Tests show that been completed in the preparation of the national types and thread forms of gauges for inspecting the no loss of strength is occasioned by such 'crossing' standards. The British and the American Standards Unified thread. except possibly in the case of high-tensile nuts, the have recently been published, as B.S. 1580 and use of which is anyway undesirable from the strength For the convenience of users in countries in which National Bureau of Standards Circular No. 479 res aspect. the metric system of measurement has been generally pectively, and the Canadian Standard is to be expected shortly. adopted, the metric equivalents of all the tables of The newly-issued British Standard 1580 furnishes dimensions and tolerances are given in an appendix. The thread system is to be known in all three coun all the technical data necessary to ensure the inter- tries as the 'Unified Screw Thread System' and com The Standards organizations in the three countries changeability of threaded products made to this stand mon designations for the various threads have been concerned will maintain continuous co-operation for ard and to the corresponding American and Canadian agreed. The system at present relates to threads ¼ in. the development and extension of this standard. Dis standards. and larger for bolts, nuts, screws and engineering cussions are already proceeding in Great Britain on It defines the basic thread form and gives the num details; no common agreement has yet been reached the question of a Unified thread system for sizes erical data associated with this thread form for all of regarding threads smaller than ¼ in. or pipe threads. below ¼ in. and on the general dimensions of bolts and the common pitches from 36 to 4 thread per inch. The system embraces a defined thread form, two nuts with the Unified thread. A comprehensive series Complete tables of dimensions are given for the two regular diameter/pitch series, namely a coarse series of standard definitions relating to screw threads is now regular diameter/pitch scries, namely the Unified and a fine series, and the appropriate tolerances for practically agreed betweeen the three countries and Coarse thread scries (designated UNC) from ¼ in. three classes of threads in the regular scries and also will in due course be issued as a separate British to 4 in. diameter, and the Unified Fine thread scries for threads of special diameters and pitches. Standard. (designated UNF) from ¼ in. to 1½ in. diameter. The The form of thread is one having a 60 deg. angle. pitches in the Unified Coarse series are identical with The present specification is issued at this stage as a The bolt (external) thread has a rounded root with the those of the B.S.W. series; those for the Unified Fine provisional British Standard. It is intended that, at the alternatives of a rounded crest for use in the United series are somewhat finer than the B.S.F. series. end of six months, it shall be reviewed in order that Kingdom and a flat crest for use in the U.S.A. The Three classes of work tolerances are given. In the it may be confirmed as one of the series of British nut (internal) thread follows conventional practice in fine class there is no allowance between maximum Standards for screw threads. Comments on the stand having a cleared minor diameter to facilitate tapping. screw and minimum nut, but in the medium and free ard will be welcomed and should be sent to the British Proceeding concurrently with the technical dis classes such an allowance is provided. The effective Standards Institution by not later than December 31. cussions between the three countries over the last four diameter tolerances are calculated from a three-part Price 7s. 6d. December 1949
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Dec 1, 1949
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