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Uses. Reusable writing surface on which text or drawings are made. 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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.
Overhead projector. An overhead projector (often abbreviated to OHP ), like a film or slide projector, uses light to project an enlarged image on a screen, allowing the view of a small document or picture to be shared with a large audience. In the overhead projector, the source of the image is a page-sized sheet of transparent plastic film ...
Bulletin boards are often made of a material such as cork to facilitate addition and removal of messages, as well as a writing surface such as blackboard or whiteboard. A bulletin board which combines a pinboard (corkboard) and writing surface is known as a combination bulletin board. Bulletin boards can also be entirely in the digital domain ...
Brand Name Banquet. Recipes from brand name companies often get a bad rap. But many people learned to cook from the backs of boxes, bottles, and jars, especially in the 1950s, 60s, and 70s when ...
The writing slate consisted of a piece of slate, typically either 4x6 inches or 7x10 inches, encased in a wooden frame. [1] A slate pencil was used to write on the slate board. It was made from a softer and lighter coloured stone such as shale or chalk. Usually, a piece of cloth or slate sponge was used to clean it and this was sometimes ...
An old-fashioned wire gym basket held the colored chalk pieces Sterling was checking out. From the scribbling on the board it appeared that Bronze, holding an eraser, was working on some sort of ...
Einstein's Blackboard is a blackboard [1] which physicist Albert Einstein (1879–1955) used on 16 May 1931 during his lectures while visiting the University of Oxford in England. [2] [3] The blackboard is in the collection of the Museum of the History of Science in Oxford. [4] [5] The equations in the blackboard are related to the cosmological ...
1920s–2001. Magic Slate (also known as Magic Slate paper saver) is a children's drawing toy. It was invented by R. A. Watkins in 1923 in the United States, and has remained in production for over seven decades. Besides being a toy, it is also used as an erasable message board and a communication device for people unable to speak.
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