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Hand-drawn Holograms: how holographic? You might want to read this first: 2003 SPIE PAPER (No, scratch-holograms are not stereo pairs. The main website contains a stereo photograph of a working scratch-hologram of a glowing cube. If you want to see a true scratch-hologram in full 3D, you'll have to make one yourself.) BRIEF VERSION: Benton's white-light 'rainbow' holograms employ size-independent fringe spacing, they employ no diffraction in reconstructing images, and they will still function if enlarged or reduced. A scratch hologram is essentially a Benton hologram greatly enlarged and with fringe count reduced. So, if scratch holograms aren't true holograms, then to be honest and consistent, Rainbow holograms aren't true holograms either.
First of all, be aware that diffraction gratings do not function exclusively by optical interference. Here's another way to say it. Here's why I call these images "holograms" Points on object are recorded on the plate as "zoneplates" which focus light. The lines are microscopic. Festival Nauke 2011. 3rd Eye / TAKEHITO ETANI. Flying carpet. Low-flying carpet Use the hose to fill the compressed-air tank. Release the hose by pressing the button and push yourself off to slide. The carpet remains in the air for about 30 seconds, as it ‘flies’. In the end, the air in the tank runs out, the air stream weakens, the pressure under the carpet decreases and the carpet lowers to the ground.
The air leaks through the small holes in the bottom of the tank, thereby forcing the carpet upwards. The same principle is applied to a hovercraft, which is an extremely handy means of transportation in the Finnish archipelago during the period when the sea is thawing out in spring. Links Cat MatikainenFlying carpet. Heureka, huudahti hän! Luokkamme matkasi tänään Heurekaan. On siis luokkaretkien aika, se on se kevät ja kouluissakin heitetään vapaalle...koulutyö siirtyy taka-alalle ja otetaan jo rennommin. Se ollaan kaikki ansaittu, niin opet, avustajat kuin oppilaat itsekin. Presidenttejämme. Nää on nyt näitä pakollisia kuvaamisia...sieltä täältä. Mutta, ei anneta sen nyt haitata, enää. Foliopallonen. Nämä kuvat ovat ns. vapaalta näyttelyalueelta. Oppilaat saivat ensin ottaa itsestään kuvan, sen jälkeen se siirtyi "työstöön" ja toisessa päässä prosessia putkahti kolikko, oppilaan kuvalla varustettuna.
Leijuva pallo. Meillä oli ohjelmassa Minerva-tiedepaja, jossa mietittiin miksi "lehmä ei lennä". Tämä erikoinen professorityyppinen hemmo esitteli meille asioita joita lentämiseen tarvitaan. Karkkitehtuuria Tämä oli ehkä koko reissun parasta antia. Tässä yläkuvassa oli malli, ja sen jälkeen oppilaille annettiin ohjeet, kerrottiin rakentamisen isoista pääperiaatteista, miten rakennuksesta saa vahvan ja kestävän.
Möebius.
Mechanical. Mathematics Everywhere & Everyday.