The
helicoid, after the plane and the catenoid , is the third minimal surface to be known. Description: It was first discovered by Jean
Kaynak: HelicoidSecondary buds always develop on the same side of the stem:
helicoid cyme or bostryx. The successive pedicels are aligned on the same plane:
Kaynak: InflorescenceThe crystal siltsnail also known as the
helicoid spring snail, scientific name Cincinnatia helicogyra, is a species of small freshwater
Kaynak: Crystal siltsnailHelicoid transformation : Image:helicatenoid. gif | Animation showing the deformation of a
helicoid into a catenoid. shape of a
helicoidKaynak: Catenoid Other examples are a conical surface with elliptical directrix , the right conoid , the
helicoid , and the tangent developable of a
Kaynak: Ruled surfaceIn 1776 Jean Baptiste Marie Meusnier discovered that the
helicoid and catenoid satisfy the equation, and that the differential
Kaynak: Minimal surface8 mm F2.8 Fisheye | 180° (circle) | 11–7 | Auto | 2.8–22 | 0.2 m | - | Straight
helicoid | 640 g | 82 mm | 102 mm | Not necessary |
Kaynak: Olympus OM systemSerpiginous choroiditis, also known as geographic or
helicoid choroidopathy, is an uncommon chronic progressive inflammatory disease
Kaynak: Serpiginous choroiditisHe also discovered the
helicoid . He worked with Lavoisier on the decomposition of water and the evolution of hydrogen . Dirigible
Kaynak: Jean Baptiste MeusnierA "filled-in" helix – for example, a spiral ramp – is called a
helicoid Helices are important in biology , as the DNA molecule is formed
Kaynak: HelixAnother description is a
helicoid constructed from the tractrix Uses: Renditions of Dini's surface have appeared on the covers of Western
Kaynak: Dini's surfaceUntil its discovery, the plane ,
helicoid and the catenoid were believed to be the only embedded minimal surfaces that could be formed by
Kaynak: Costa's minimal surfaceThey were the third non-trivial examples of minimal surfaces (the first two were the catenoid and
helicoid The two surfaces are
Kaynak: Scherk surfacelines; Riemann proved that they were the only minimal surfaces fibered by circles in parallel planes besides the catenoid ,
helicoid and plane.
Kaynak: Riemann's minimal surfaceany known biological material The structural coloration is created by Bragg reflection from
helicoid ally stacked cellulose microfibrils .
Kaynak: Pollia condensataThe tube strongly simulates the shell of certain serpulid sea worms or
helicoid land snails and contain no less than 75% calcium
Kaynak: MachaerotidaeThe Signet 35 has a coupled coincident image rangefinder , an excellent Ektar 44mm f3.5 lens with rear
helicoid focus, automatic film
Kaynak: Kodak SignetLenses that use the bayonet inside the camera need have no focusing
helicoid built into the lens barrel. As a consequence, the 5 cm f/1.4
Kaynak: Nikon S-mountthe hyperboloid , the
helicoid and the cone , which reflect the forms Gaudí found in nature Ruled surfaces are forms generated by a
Kaynak: Antoni Gaudí