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| Results 1 - 10 of about 62 for the
Pinhole
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Pinhole glasses are eyeglasses with a series of pinhole-sized perforations filling an opaque sheet of plastic in place of each lens. Similar to the workings of a pinhole camera , each perforation allows only very narrow beam of light to enter the eye which reduces the size of the circle of confusion on the retina and increases depth of field . In eyes with refractive error...
http://www.all-about-all.info/article/Pinhole glasses
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Principle of a pinhole camera. Light rays from an object pass through a small hole to form an image. A pinhole camera is a camera without a lens . The light producing the image passes through a small hole. In order to produce a reasonably clear image, the aperture has to be a small pinhole on the order of 0.02 inches (0.5 mm) or less. The shutter of a pinhole camera...
http://www.all-about-all.info/article/Pinhole camera
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Principle of a pinhole camera. Light rays from an object pass through a small hole to form an image. A pinhole camera is a camera without a lens . The light producing the image passes through a small hole. In order to produce a reasonably clear image, the aperture has to be a small pinhole on the order of 0.02 inches (0.5 mm) or less. The shutter of a pinhole camera...
http://www.all-about-all.info/article/Pinhole camera
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...in every direction, but that only one ray from each point, which strikes the eye perpendicularly, can be seen. The other rays strike at different angles and are not seen. He used the example of the pinhole camera , which produces an inverted image, to support his argument. Alhazen held light rays to be streams of minute particles that travelled at a finite speed. He improved Ptolemy 's theory...
http://www.all-about-all.info/article/Light
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...incompetent) demons and finds the Sacred Circle of Protection. Since the demons can't enter the circle, Torg hangs out there until he is rescued by Alt-Riff and Alt-Zoë of the Dimension of Lame; a pinhole of a portal is left behind in the Circle of Protection, and so the Demon King orders a super-evil mop of the heavens so he can get at the other dimension. Torg leaves for his own dimension with...
http://www.all-about-all.info/article/Sluggy Freelance
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...to the Department of Energy 's Hanford Nuclear Reservation in Washington state where they are buried. The burial trenches have been evaluated to be secure for at least 600 years before the first pinhole penetration of some lead containment areas of the reactor compartment packages occurs, and several thousand years before leakage becomes possible. Until 1991 , the forward and aft sections of...
http://www.all-about-all.info/article/Ship-Submarine recycling program
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...a white piece of paper or card using a pair of binoculars (with one of the lenses covered), a telescope, or another piece of cardboard with a small hole in it (about 1 mm diameter), often called a pinhole camera . The projected image of the sun can then be safely viewed; this technique can be used to observe sunspots , as well as eclipses. However, care must be taken to ensure that no-one looks...
http://www.all-about-all.info/article/Solar eclipse
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...devices today are still known as " cameras ". The principle of the camera obscura can be demonstrated with a rudimentry type, just a box (which may be room-size) with a hole in one wall, (see Pinhole cameras for construction details). Light from only one part of a scene will pass through the hole and strike a specific part of the back wall. The projection is made on paper on which an artist...
http://www.all-about-all.info/article/Camera obscura
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... photography , the camera itself can be traced back much further. Photographic cameras were a development of the camera obscura , a device dating back at least to the 11th century which uses a pinhole or lens to project an image of the scene outside onto a viewing surface. Before the invention of photography, there was no way to preserve the images produced by these cameras apart from manually...
http://www.all-about-all.info/article/Camera
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...seen, called the plica semilunaris, representing the third eyelid of birds and many mammals. By gently drawing down the lower eyelid the lower punctum may be seen close to the caruncula; it is the pinhole opening into the lower of the two canaliculi which carry away the tears to the lachrymal sac and duct. Jaw On the side of the face the facial artery may be felt pulsating about an inch...
http://www.all-about-all.info/article/Face
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Also helps finding: pinholed, penhole, pinhoe, inhole, pnhole, pihole, pinole, pinhle, pinhoe, pinhol, oinhole, linhole, punhole, ponhole, pjnhole
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