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ERRATA ANSI B 1 . l l - 1958 (R1972) MICROSCOPE OBJECTIVE THREAD (JULY 1972) Page 5, Section 7 should read, American National Standard ANSI B1.7-1965 (R1972) Page 6, Section 14 should read, Angle Deviation. COPYRIGHT American Society of Mechanical Engineers Licensed by Information Handling Services A M E R I C A N S T A N D A R D h Microscope ASA B1.11-1!58 , UDC 621.882.082:535.822:681.42 \ $ .. 1 Society of Aufomotive Engineers The American Society of Mechanical Enginee
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  ERRATA ANSI B1.ll - 958 (R1972)MICROSCOPE OBJECTIVE THREAD (JULY 1972) Page 5, Section 7 should read, American National Standard ANSIB1.7-1965 (R1972) Page 6, Section 14 should read, Angle Deviation. COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services  h AMERICAN STANDARD Microscope ASA B1.11-1!58 UDC 621.882.082:535.822:681.42 , \ Society of Aufomotive EngineersThe American Society of Mechanical Engineers .. 1 Society of Aufomotive EngineersThe American Society of Mechanical Engineers -r /?LShLed 6y THEAMERICANS0ClET.Y OF MECHANICAL ENGINEERS -~. ~ .~ .. ~ ~ 29 West 39th Street, New York 18, N. Y. -~ . - = __..~ - .- ~ ~~ ~ ._ -r . -~. ~ .~ .. ~ ~ 29 West 39th Street, New York 18, N. Y. -~ . - = __..~ - .- ~ ~~ ~ COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services  ASME BL-LZ 58 m 0757b70 0037888 T W Foreword The standardizationof the microscope objective thread is one of the projects toward unificationof screw thread standards among inch-using countries. In Great Britain, the Royal MicroscopicalSociety had established standards for microscope objectives in 1858, based on the Whitworthscrewthread system, which were subsequently used throughout the world. The history of this standardis n the Transactions of the Society: 1858, p. 39; 1859, p. 92; 1896, pp. 389, 487; 1911, p. 175;1915, p. 230; 1924, p. 266; and 1936, p. 377.In.practice, American manufacturers of this thread have always employed modifications of theWhitworth form because of their preference for flat crests, such modified threads being completelyinterchangeable with the RMS threads. At the Conference on Unification of Engineering Stand-ards held in Ottawa, 1945, the American Delegation resented ASA Paper B1/57 and A.O. DrawingED-95 giving limits of size for a truncated Whitwort K thread. Since a thread form with roundedcrest is preferred in Great Britain for optical instruments, it was recommended that the itle of thisdocument be amended to read, “Proposed Permitted Truncation andTolerances for RMSThread.”On the basis of this proposal a draft of a proposed American Standard, dated April, 1948, was cir-culated to the B1 Sectional Committee membership for comment. In conformity with commentsreceived, a revised draft, dated October, 1954, mas approved by Subcommittee No. 4 on InstrumentScrew Threads and subsequently submittedo theSectional Committee for approval. Final approvalas an American Standard was given on January 7, 1958, by ASA. Any part of this standard may be quoted. Credit lines should read: “Extracted rom AmericanStandard Microscope Objective Thread (ASA Bl.11-1958) with the permission of the publisher, TheAmerican Society of Mechanical Engineers, 29 W. 39th St., New York 18, N. Y.’’ COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services  ASME BL-LL 58 m O757670 037887 L 9 Officers of Sectional Committee on Standardization and Unification of Screw Threads, B1 Frank P. Tisch, Chairman William H. Gourlie, Vice-Chairman W. C. Cadwell, Secretary Personnel of Subcommittee No. 4 on Instrument Screw Threads E. W. Dresher, Chairman, Mgr,, QualityControl, Hathaway Instrument Division, Hamilton Watch Company, J. C. Burgbacher, Engineer, Bulova Watch Co., Flushing, N. Y. F. L. Calkins, Commander, WCXPS, Wright Air Development Center, Wright-Patterson Air Force Base, Ohio J. W. Evans, Commander, WCLS J3 Special Products Branch, Aircraft Labs., Wright Air Development Center K. E. Faiver, Senior Design Engr., Olds Motor Div., General Motors Corp., Lansing, Mich. R. F, Frye, Mgr., Materials & Stds. Dept., Westinghouse Electric Corp., East Pittsburgh, Pa. I. H. Fullmer, Chief, Engineering Metrology Sec., National Bureau of Standards, Washington, D. C. W. H. Gourlie, Standards Engr., The Sheffield Corp., Dayton, Ohio V. C. Meigs, Engineering Dept., Autonetics, a division of North American Aviation, Inc., Bellflower, Calif. D. R. Miller, 3521 36th St., N.W., Washington, D. C. J. H. Miller, Vice-Pres., Weston Electrical Instrument Corp., Newark, N. J. D. V. Peroni, Commander, WCXPS, Wright Air Development Center, Wright-Patterson Air Force Base, Ohio H. W. Robb, Manager, Company Standards, Engineering Services Div., General Electric Co., Schenectady, N. Y. E. H. Schaeffer, Chief Engr., Elgin National Watch Co., Elgin, Ill. M. A. Schultheis, Staff Engr., Systems Development Lab., Hughes Aircraft Co., Culver City, Calif. C. E. Smart, Works-Mgr., W, & L. E. Gurley, Troy, N. Y. C. S. Tallman, Development Physicist, American Optical Co., Instrument Div., Buffalo, N. Y. S. B. Terry, Orient, L. I., N. Y. K. T. Vande, Chief Draftsman, Bausch & Lomb Optical Co., Rochester, N. Y, D. F. Viles, President, Waltham Screw Co., Waltham, Mass. P. F. Weber, Asst, to Pres., Kollsman Instrument Corp., Elmhurst, Long Island, N. Y. Denver, ColoradoWright-Patterson Air Force Base, Ohio COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
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