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Glass block, also known as glass brick, is an architectural element made from glass used in areas where privacy or visual obscuration is desired while admitting light, such as underground parking garages, washrooms, and municipal swimming baths. Glass block was originally developed in the early 1900s to provide natural light in industrial ...
In numismatics, reeded edges are often referred to as "ridged" or "grooved" (American usage), or "milled" (British usage). [3] Some coins, such as United States quarters and dimes, 1 euro, Australian 5, 10, 20 cents, 1 and 2 dollars, as well many other current coins, have reeded edges. One reason for having reeded edges was to prevent ...
Pressed glass (or pattern glass) [1] is a form of glass made by pressing molten glass into a mold using a plunger. [2] Although hand pressed glass has existed for over 1,000 years, the use of a machine for pressing was first patented by Pittsburgh glass man John P. Bakewell in 1825 to make knobs for furniture.
Glass can be "double rolled", which means it is passed through two cylinders at once (similar to the clothes wringers on older washing machines) to yield glass of a specified thickness (typically about 1/8" or 3mm). The glass is then annealed. Rolled glass was first commercially produced around the mid-1830s and is widely used today.
A partial collar occurs when an out-of-position collar leaves a line around the coin which is visible when looking at its edge. A partial collar is sometimes called a railroad rim when a reeded edge coin is involved as the line resembles a rail and the reeds resemble railroad ties.
Dieu★ protège★la★France★★★ "God protect France" on the edge of 1873 five-franc coins Examples of edge inscriptions or edge lettering include e pluribus unum on the edge of U.S. Presidential dollar coins, various national €2 edge inscriptions, and various phrases on the UK one pound coin, most commonly decus et tutamen.
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