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A blackboard or a chalkboard is a reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate, known, when used for this purpose, as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.
[1] [5] Most of the photographs show the chalkboard in a moment drawn from the mathematician's work on it, [1] depicting how mathematicians think, work, and communicate with each other. [5] Some other photographs show chalk drawings that were deliberately created to be photographed for this book. The mathematicians themselves are not depicted. [1]
A simple wooden wall shelf A wooden shelf with a great number of different hair colours in a hairdresser shop in Germany. A shelf (pl.: shelves) [1] is a flat, horizontal plane used for items that are displayed or stored in a home, business, store, or elsewhere.
The chalkboard features words like "scare," "frighten," and "startle." ... There's sailboat wallpaper, a wooden fish on his wall, and even fish-print sheets on his bed. Salem, Massachusetts, where ...
A combination between a whiteboard and a cork bulletin board Original early 1960s ad for "Plasti-slate", the first whiteboard/dry erase board invented by Martin Heit. It has been widely reported that Korean War veteran and photographer Martin Heit and Albert Stallion, an employee at Alliance, a leading flat rolled steel sheet supplier should be credited with the invention of the whiteboard in ...
1959: W.F. Lewis is issued a patent for a combined chalkboard and bulletin board. [4] 1978: The concept of the bulletin board entered the information age when software developers Ward Christensen and Randy Suess launched the first public dialup bulletin board system. [5]
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