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Benjamin Huntsman
- By 1740, Benjamin Huntsman was making straight razors complete with decorated handles and hollow-ground blades made from cast steel, using a process he invented.
en.wikipedia.org/wiki/Straight_razor
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What is a straightedge used for?
In 1999, William Tsitsos wrote that Straight Edge had gone through three eras since its founding in the early 1980s. [ 9 ] Bent edge began as a counter-movement to straight edge by members of the Washington, D.C., hardcore scene who were frustrated by the rigidity and intolerance in the scene. [ 10 ]
The ancient Greek mathematicians first attempted straightedge-and-compass constructions, and they discovered how to construct sums, differences, products, ratios, and square roots of given lengths. [2]: p. 1 They could also construct half of a given angle, a square whose area is twice that of another square, a square having the same area as a gi...
Dec 7, 2014 · Euclid did not invent the compass or the straightedge; compasses and straightedges were used before Euclid for many purposes. In fact, they had better tools. A labelled straightedge (i.e. a ruler) allows one to do much more, including trisect an angle, and this was known to the Greeks.
Jan 2, 2021 · The only possibility is that all three edges are straight lines. The process is described in the book M. Berger, Geometry revealed (Springer 2009), on p. 270. He claims that perfect rulers are made by this process to this day.
A straightedge or straight edge is a tool used for drawing straight lines, or checking their straightness. If it has equally spaced markings along its length, it is usually called a ruler.
The term straight edge came from D.C. band Minor Threat’s 1981 song of the same name. Unlike many hardcore musicians at the time, Minor Threat front man Ian MacKaye was decidedly sober and was frustrated with the scene’s reliance on recreational drugs and alcohol.
Oct 21, 2019 · Euclid, the Greek mathematician who wrote the geometry text used for centuries, stated many of his theorems in terms of constructions. His axioms are closely related to the tools he used for construction.
