![]() To make the ABC logo, adjust the dot's vertical speed so that it is 3 times faster than its horizontal speed. Use the horizontal or vertical sliders to change the pattern. In the Sim below you can make your own Lissajous patterns. so the choice of a 3:1 logo turned out to be very wise! Today the ABC has three arms:- Radio, Television and Online. So the ABC decided to base their logo a 3:1 ratio. But back in 1965, the figure of 8 logo was being used by the University of the Air. ![]() (This makes an infinity symbol or a figure of eight lying on its side). A Lissajous pattern seemed a good motif, common to both radio and television.īecause the ABC broadcast in both radio and television, it seemed like 2:1 would be a good ratio. Before the days of electronic frequency counters, broadcast engineers often used Lissajous patterns to help tune equipment. Well, the ABC is both a radio network and a television network. ![]() Why did the ABC choose a Lissajous figure for its logo? The ABC logo is a 3:1 Lissajous figure - if Lissajous wanted to see this pattern he would have to get one of his tuning forks to vibrate three times faster than the other. When he set up two tuning forks at right angles, with one vibrating at twice the frequency of the other, Lissajous found that the curved lines on the screen would combine to make a figure of eight pattern. For example, by attaching a mirror to a tuning fork and shining a light onto it, Lissajous was able to observe, via another couple of mirrors, the reflected light twisting and turning on the screen in time to the vibrations of the tuning fork. He started off standing tuning forks in water and watching the ripple patterns, but his most famous experiments involved tuning forks and mirrors. ![]() Like many physicists of his time, Lissajous was interested in being able to see vibrations. The three tuning forks are bigger and the tips are in line with the outer circle. Jules Antoine Lissajous was a French physicist who lived from 1822 to 1880. The tips of the three tuning forks are contained in the inner circle. We suggest that such anomalous features derive from the superfluid $^4$He film on the oscillator surface.To view this page, you need a plug-in called Shockwave that you can download free from the web. We also observed a maximum in the fork resonance frequency at temperatures where the transition in quasiparticle flow from the hydrodynamic to the ballistic regime is expected. Download icons in all formats or edit them for your designs. These free images are pixel perfect to fit your design and available in both PNG and vector. Get free Tuning fork icons in iOS, Material, Windows and other design styles for web, mobile, and graphic design projects. We found that this anomalous behavior has a rather strong pressure dependence, and it practically disappears above the crystallization pressure of $^4$He. Download 2132 free Tuning fork Icons in All design styles. However, even with small amount of $^4$He covering the surfaces, we have observed saturation already at significantly higher temperatures than anticipated, where we have other indicators to prove that the $^3$He liquid is still cooling. Riekki and 4 other authors Download PDF Abstract:In pure superfluid $^3$He-B at ultra-low temperatures, quartz tuning fork oscillator response is expected to saturate when the dissipation caused by the superfluid medium becomes substantially smaller than the internal dissipation of the oscillator. Download a PDF of the paper titled Effects of $^4$He film on quartz tuning forks in $^3$He at ultra-low temperatures, by T.
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