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  • BS EN ISO 7944:1998

    Current The latest, up-to-date edition.

    Optics and optical instruments. Reference wavelengths

    Available format(s):  Hardcopy, PDF

    Language(s):  English

    Published date:  15-08-1998

    Publisher:  British Standards Institution

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    Abstract - (Show below) - (Hide below)

    Covers two procedures to determine the tensile strength of fabrics coated with rubber or plastics, using the strip test and grab test methods. Applicable to test pieces in equilibrium having specified standard atmosphere for testing, and to wet test pieces. Both procedures need the use of a constant rate of extension tensile-testing machine.

    Scope - (Show below) - (Hide below)

    This International Standard specifies two reference wavelengths to be used for the characterization of optical materials, optical systems and instruments, as well as ophthalmic lenses. It defines the associated principal refractive indices and principal dispersions, as well as the Abbe numbers with regard to these reference wavelengths and principal dispersions.

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    Committee CPW/172
    Development Note Supersedes 96/540151 DC and BS 7017(1988) (06/2005)
    Document Type Standard
    Publisher British Standards Institution
    Status Current
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    BS 7394-2:2007 Complete spectacles Specification for prescription spectacles
    07/30082138 DC : DRAFT FEB 2007 BS 7394-2 - COMPLETE SPECTACLES - PART 2: SPECIFICATION FOR PRESCRIPTION SPECTACLES
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