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  2. Spirograph - Wikipedia

    en.wikipedia.org/wiki/Spirograph

    Spirograph is a geometric drawing device that produces mathematical roulette curves of the variety technically known as hypotrochoids and epitrochoids.The well-known toy version was developed by British engineer Denys Fisher and first sold in 1965.

  3. Spherometer - Wikipedia

    en.wikipedia.org/wiki/Spherometer

    A spherometer is an instrument used for the precise measurement of the radius of curvature of a curved surface. Originally, these instruments were primarily used by opticians to measure the curvature of the surface of a lens .

  4. Sagitta (geometry) - Wikipedia

    en.wikipedia.org/wiki/Sagitta_(geometry)

    Visualization of the sagitta. In geometry, the sagitta (sometimes abbreviated as sag [1]) of a circular arc is the distance from the midpoint of the arc to the midpoint of its chord. [2]

  5. Lens clock - Wikipedia

    en.wikipedia.org/wiki/Lens_clock

    Lens clock. A lens clock is a mechanical dial indicator that is used to measure the dioptric power of a lens.It is a specialized version of a spherometer.A lens clock measures the curvature of a surface, but gives the result as an optical power in diopters, assuming the lens is made of a material with a particular refractive index.

  6. Wikipedia:How to draw a diagram with Inkscape - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:How_to_Draw_a...

    Now you should have a nice circle, with a solid black outline that is completely closed. If you have a Pac-Man shape or an arc, simply click the "make whole" button in the upper toolbar. Changing object fill colours using HSV sliders. Adding eyes. Now for the next step, create a smaller circle and then right click its outline (on Mac, use apple ...

  7. Isometric projection - Wikipedia

    en.wikipedia.org/wiki/Isometric_projection

    Isometric video game graphics are graphics employed in video games and pixel art that utilize a parallel projection, but which angle the viewpoint to reveal facets of the environment that would otherwise not be visible from a top-down perspective or side view, thereby producing a three-dimensional effect.

  8. Sagitta (optics) - Wikipedia

    en.wikipedia.org/wiki/Sagitta_(optics)

    Deep blue ray refers the radius of curvature and the red line segment is the sagitta of the curve (black).. In optics and especially telescope making, sagitta or sag is a measure of the glass removed to yield an optical curve.

  9. Blueprint - Wikipedia

    en.wikipedia.org/wiki/Blueprint

    Architectural drawing, Germany, 1902 Architectural drawing, Canada, 1936. The blueprint process is based on a photosensitive ferric compound. The best known is a process using ammonium ferric citrate and potassium ferricyanide. [6] [7] The paper is impregnated with a solution of ammonium ferric citrate and dried. When the paper is illuminated ...

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