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The Gestetner Cyclograph was a stencil-method duplicator that used a thin sheet of paper coated with wax (originally kite paper was used), which was written upon with a special stylus that left a broken line through the stencil, removing the paper's wax coating. Ink was forced through the stencil (originally by an ink roller), and it left its ...
He decided to try to find a better method, and his experiments eventually led him to invent the first method of reproducing documents by use of a stencil. He went on to work in Chicago, making kites out of Chinese paper. Gestetner allegedly perceived the idea of the duplicating method after an ink-spill accident whilst vending kites in Chicago.
Just like baking soda and vinegar simulate a volcanic eruption, baking soda interacts with acidic ingredients in doughs and batters to create bubbles of CO 2. But instead of spilling out of a ...
The history of scientific method considers changes in the methodology of scientific inquiry, not the history of science itself. The development of rules for scientific reasoning has not been straightforward; scientific method has been the subject of intense and recurring debate throughout the history of science, and eminent natural philosophers and scientists have argued for the primacy of ...
The Cranfield experiments were a series of experimental studies in information retrieval conducted by Cyril W. Cleverdon at the College of Aeronautics, today known as Cranfield University, in the 1960s to evaluate the efficiency of indexing systems. [1] [2] [3] The experiments were broken into two main phases, neither of which was computerized ...
1021 – Ibn al-Haytham (Alhacen) pioneers the experimental scientific method and experimental physics in his Book of Optics, where he devises the first scientific experiments on optics, including the first use of the camera obscura to prove that light travels in straight lines and the first experimental proof that visual perception is caused ...
During commercial powder processing [3] [125] [126] or in natural processes such as dust storms, [127] [128] [8] triboelectric charge transfer can occur. There can be electric fields of up to 160kV/m with moderate wind conditions, which leads to Coulomb forces of about the same magnitude as gravity. [ 129 ]
A cyclograph (also known as an arcograph) is an instrument for drawing arcs of large diameter circles whose centres are inconveniently or inaccessibly located, one version of which was invented by Scottish architect and mathematician Peter Nicholson.