It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Thank you.
Some features of ATS will be disabled while you continue to use an ad-blocker.
It's a little hard to describe and as the comments show it's a bit different for each person because our brains fill in the blanks and don't do it all the same way.
Originally posted by ghostingmiranda
Well I am sort of lost on what is supose to happen because I could tell the difference between faces, and recognized some of them not all of them though.
And if you don't know geometry well or don't want to do the math, then just experiment.
The blind spot is located about 12–15° temporal and 1.5° below the horizontal and is roughly 7.5° high and 5.5° wide.
It's kinda cool and a little creepy. The person standing at the other focal point is a long distance away, yet they can whisper and it sounds like their mouth is only a few inches from your ear. And in between those two focal points, the bystanders can't really hear the whisper. It's cool.
Opened as a permanent exhibit in 1938, the Whispering Gallery demonstrates the wonders of sound wave communication. The concept of this exhibit is to allow a whisper to travel from one focal point in the room to another. The “gallery” is designed in the form of an ellipsoid (similar to a football), with two arched-shaped dishes placed at either end. When you whisper directly into the dish, your voice will be transported across the room and received by the listener standing in front of the other dish. Each dish serves as a point of focus in the room. When sounds are made inside the room, the line of sound reflects directly to the focus at the other end of the room.
Originally posted by Arbitrageur
reply to post by IAmD1
That's a little off topic but since you asked and the thread seems to be dying anyway, I'll risk an answer. The best sound trick I ever heard was in the Museum of Science and Industry in Chicago:
Whispering Gallery
It's kinda cool and a little creepy. The person standing at the other focal point is a long distance away, yet they can whisper and it sounds like their mouth is only a few inches from your ear. And in between those two focal points, the bystanders can't really hear the whisper. It's cool.
Opened as a permanent exhibit in 1938, the Whispering Gallery demonstrates the wonders of sound wave communication. The concept of this exhibit is to allow a whisper to travel from one focal point in the room to another. The “gallery” is designed in the form of an ellipsoid (similar to a football), with two arched-shaped dishes placed at either end. When you whisper directly into the dish, your voice will be transported across the room and received by the listener standing in front of the other dish. Each dish serves as a point of focus in the room. When sounds are made inside the room, the line of sound reflects directly to the focus at the other end of the room.
A whispering gallery is most simply constructed in the form of a circular wall, and allows whispered communication from any part of the internal side of the circumference to any other part. The sound is carried by waves, known as whispering-gallery waves, that travel around the circumference clinging to the walls, an effect that was discovered in the whispering gallery of St Paul's Cathedral in London.[1] The extent to which the sound travels at St Paul's can also be judged by clapping in the gallery, which produces four echoes.[2] Other historical examples[3][4][5] are the Gol Gumbaz mausoleum in Bijapur and the Echo Wall of the Temple of Heaven in Beijing. A hemispherical enclosure will also guide whispering gallery waves.
The gallery may also be in the form of an ellipse or ellipsoid,[4] with an accessible point at each focus. In this case, when a visitor stands at one focus and whispers, the line of sound emanating from this focus reflects directly to the focus at the other end of the gallery, where the whispers may be heard. In a similar way, two large concave parabolic dishes, serving as acoustic mirrors, may be erected facing each other in a room or outdoors to serve as a whispering gallery, a common feature of science museums. Egg-shaped galleries, such as the Golghar Granary at Bankipore,[3] and irregularly shaped smooth-walled galleries in the form of caves, such as the Ear of Dionysius in Syracuse,[4] also exist.
The term 'whispering gallery' has been borrowed in the physical sciences to describe other forms of whispering-gallery waves such as light or matter waves.