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A set of the three most common French curves, also known as a Burmester set. The bottom object is most commonly used for hyperbolas; the smaller one above it is suited for ellipses. The large one is used mostly for parabolas. [1] A French curve is a template usually made from metal, wood or plastic composed of
French curves are used for drawing curves which cannot be drawn with compasses. A faint freehand curve is first drawn through the known points; the longest possible curve that coincides exactly with the freehand curve is then found out from the French curves. Finally, a neat continuous curve is drawn with the aid of the French curves.
Primary among these are the compasses, used for drawing arcs and circles, and the French curve, for drawing curves. A spline is a rubber coated articulated metal that can be manually bent to most curves. Drafting templates assist the drafter with creating recurring objects in a drawing without having to reproduce the object from scratch every time.
Print/export Download as PDF; Printable version; In other projects ... An elementary treatise on cubic and quartic curves by Alfred Barnard Basset (1901) online at ...
French curve – Template made from metal, wood or plastic composed of segments of smooth curves; Lesbian rule – Flexible strip of lead for use in molding; Technical drawing tool – Tools and instruments used for accurate and precise manual drafting; Spline (mathematics) – piecewise polynomial curves that smoothly interpolate points
ISO Lettering templates, designed for use with technical pens and pencils, and to suit ISO paper sizes, produce lettering characters to an international standard. The stroke thickness is related to the character height (for example, 2.5 mm high characters would have a stroke thickness - pen nib size - of 0.25 mm, 3.5 would use a 0.35 mm pen and ...
The French scale measures the outer diameter of the catheter, not the size of the internal drainage channel (inner diameter). For instance, a two-way catheter of 20 Fr and a three-way catheter of 20 Fr have the same outer diameter, but the three-way catheter has an additional channel for irrigation, reducing the size of its drainage channel.
An equation was given for various drafting tools, such as the triangle being x=ay, the compass being X²+y²=r² and a longer equation for french curves. I would be very interested to learn about how these equations function with the traditional real-world french curve template for example. Lots to be said about french curves!
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