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malleable cast iron
Editorial change to harmonize the text with other standards in this series
angle of spray and pattern (variations of a cone shape)
BS 4142 is used to assess the impact of industrial and commercial sound
will maintain their circuit integrity for life safety and fire-fighting
Optics and optical instruments. Reference wavelengths shop-only malleable cast iron1 Scope 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.