Lens Blanks

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• Optical lens design — refers to the calculation of lens construction parameters (variables) that will meet a set of performance requirements and constraints, including cost and schedule limitations. Construction parameters include surface profile types (spherical,… …   Wikipedia

• Fresnel lens — Optics. a large lens with a surface of concentric grooves of prismatic profile, used in automobile headlights, searchlights, spotlights, etc. [1840 50; see FRESNEL] * * * Series of concentric rings, each consisting of a thin part of a simple lens …   Universalium

• Great Paris Exhibition Telescope of 1900 — The Great Paris Exhibition Telescope of 1900, with an objective lens of 1.25 m (49.2 inches) in diameter, was the largest refracting telescope ever constructed. It was built as the centerpiece of the Paris Universal Exhibition of 1900. Its… …   Wikipedia

• Harvey Littleton — Infobox Person name = Harvey K. Littleton caption = birth date = June 14, 1922 birth place = death date = death place = other names = known for = Founder, American studio glass movement occupation = Artist, educator nationality = U.S.… …   Wikipedia

• ophthalmic glass — n glass similar to optical glass but annealed in rolled sheets and used primarily for spectacle lens blanks …   Medical dictionary

• cylinder man — noun 1. : a worker who cures bricks and cinder blocks in steam pressure cylinders to hasten hardening 2. : an optical glass worker who grinds cylinder shaped lens blanks …   Useful english dictionary

• ophthalmic glass — noun : glass similar to optical glass but annealed in rolled sheets and used primarily for spectacle lens blanks …   Useful english dictionary

• clocker — I. ˈkläkə(r) noun ( s) Etymology: clock (II) + er 1. : one that times racehorses during workouts and records information that will be useful in grouping and handicapping the horses 2. : one that times a race or measures a flow (as of traf …   Useful english dictionary

• Medical prescription — ℞ redirects here. For other uses of Rx, see Rx. A prescription (℞) is a health care program implemented by a physician or other medical practitioner in the form of instructions that govern the plan of care for an individual patient.[1]… …   Wikipedia

• photography, technology of — Introduction       equipment, techniques, and processes used in the production of photographs.  The most widely used photographic process is the black and white negative–positive system (Figure 1 >). In the camera the lens projects an image of… …   Universalium

• industrial glass — Introduction       solid material that is normally lustrous and transparent in appearance and that shows great durability under exposure to the natural elements. These three properties lustre, transparency, and durability make glass a favoured… …   Universalium