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glass types are indicated by the letters in each area. The “glass line” is made up of the glasses of types K, KF,
The “glass veil.” Index (n d ) plotted against the reciprocal relative dispersion (Abbe V-value). The

“crown,” S stands for schwer, German for LLF, LF, and SF which are strung along the bottom of the veil. (Note that K stands for kron, or “heavy or dense.”) (Courtesy of Schott Glass Technologies, Inc., Duryea, Pa.)

Figure 10.3

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