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A half-circle protractor marked in degrees (180°). A protractor is a measuring instrument, typically made of transparent plastic, for measuring angles. Some protractors are simple half-discs or full circles. More advanced protractors, such as the bevel protractor, have one or two swinging arms, which can be used to help measure the angle.
Silva of Sweden AB has manufactured a wide variety of portable compasses for recreational, hiking, scientific, and marine uses over the years, including simple protractor or baseplate compasses like the Field, Expedition 3 (formerly the Ranger 3), and Expedition 4 to more sophisticated sighting compasses such as the Expedition Model 54 and the ...
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List of free analog and digital electronic circuit simulators, available for Windows, macOS, Linux, and comparing against UC Berkeley SPICE.The following table is split into two groups based on whether it has a graphical visual interface or not.
Or you can go old school: Running clubs like Cooldown Running, in 15 cities nationally, are free and more popular than ever.— ... Use it as a handy protractor help draw up your life plan, but ...
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Fully illustrated online catalogue of world's largest collection of astrolabes; Mobile astrolabe and horologium; Medieval equal hour horary quadrant; A Beginner's Guide to Basic Construction and Use of the Astrolabe (using ruler, protractor and compasses) (PDF), archived from the original (PDF) on 17 June 2015