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BS EN ISO 7944:1998

BS EN ISO 7944:1998

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Current

The latest, up-to-date edition.

Optics and optical instruments. Reference wavelengths

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

08-15-1998

Publisher

British Standards Institution

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.

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.

Committee
CPW/172
DevelopmentNote
Supersedes 96/540151 DC and BS 7017(1988) (06/2005)
DocumentType
Standard
Pages
12
PublisherName
British Standards Institution
Status
Current
Supersedes

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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Hardcopy - English
PDF - English
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