stippled lens
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Fresnel lantern — plano convex lens of equivalent powerA Fresnel lantern (or merely Fresnel) is a spotlight used in theatre, which employs a Fresnel lens to wash light over an area of the stage. The lens produces a wider, soft edged beam of light, which is… … Wikipedia
Severn Valley (Cthulhu Mythos) — The Severn Valley is the setting of several fictional towns and other locations created by horror writer Ramsey Campbell. Part of the Cthulhu Mythos started by H. P. Lovecraft, the fictional milieu is arguably the most detailed mythos setting… … Wikipedia
Lead glass — Swarovski flacon. Lead glass is a variety of glass in which lead replaces the calcium content of a typical potash glass.[1] Lead glass contains typically 18–40 weight% lead(II) oxide (PbO), while modern lead … Wikipedia
