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The Triangular Book of St. Germain or The Triangular Manuscript is an untitled 18th-century French text written in code, and attributed to the famous Count of St. Germain. It takes its name from its physical shape: the binding and sheets of vellum that comprise the manuscript are in the shape of an equilateral triangle.
The book is written at a level suitable for high school students and interested amateurs, [1] [3] and McAndrew recommends the book to them. [ 2 ] Both Baggett and Gerry Leversha find the chapter on fractals (written by Robert A. Chaffer) [ 6 ] to be the weakest part of the book, [ 1 ] [ 4 ] and Joop van der Vaart calls this chapter interesting ...
Platonism. In philosophy and specifically metaphysics, the theory of Forms, theory of Ideas, [1][2][3] Platonic idealism, or Platonic realism is a theory widely credited to the Classical Greek philosopher Plato. The theory suggests that the physical world is not as real or true as "Forms". According to this theory, Forms—conventionally ...
Measuring the height of a building with an inclinometer. Triangulation today is used for many purposes, including surveying, navigation, metrology, astrometry, binocular vision, model rocketry and, in the military, the gun direction, the trajectory and distribution of fire power of weapons. The use of triangles to estimate distances dates to ...
Flexagon. In geometry, flexagons are flat models, usually constructed by folding strips of paper, that can be flexed or folded in certain ways to reveal faces besides the two that were originally on the back and front. Flexagons are usually square or rectangular (tetraflexagons) or hexagonal (hexaflexagons).
Flatland: A Romance of Many Dimensions is a satirical novella by the English schoolmaster Edwin Abbott Abbott, first published in 1884 by Seeley & Co. of London. Written pseudonymously by "A Square", [1] the book used the fictional two-dimensional world of Flatland to comment on the hierarchy of Victorian culture, but the novella's more enduring contribution is its examination of dimensions.