Where results make sense
About us   |   Why use us?   |   Reviews   |   PR   |   Contact us  

Topic: Photographic plate

Related Topics

In the News (Wed 24 Apr 19)

  Photographic plate - Wikipedia, the free encyclopedia
Photographic plates were one of the earliest forms of photographic film, in which a light-sensitive emulsion of silver salts was applied to a glass plate.
However, photographic plates were in wide use by the professional astronomical community as late as the 1990s.
Photographic plates were also an important tool in early high-energy physics, as they get flened by ionizing radiation.
en.wikipedia.org /wiki/Photographic_plate   (442 words)

 Plate - Wikipedia, the free encyclopedia
In British heraldry, a plate is a roundel argent.
Plate such as steel plate is sheet metal in a thicker form, such as is used for boilermaking or shipbuilding.
A photographic plate is an early type of photographic film.
en.wikipedia.org /wiki/Plate   (239 words)

 Photographic Plate
Star trails are long duration photographs in which the stars appear smeared from the earth rotating underneath them.
Secure a 9-inch starfield plate on top of a larger white plate with a paper fastener in the center.
For example, to simulate the three-hour photograph of the north circumpolar stars, rotate the top plate counterclockwise 45 degrees while sweeping out the arc with the pen.
analyzer.depaul.edu /paperplate/photographic_plate.htm   (349 words)

 Physical & Photographic Proof of Radiation from the Earth:
I twisted the photographic plate in a lightproof manner in paper and set it by the same underground watercourse, as was used in Test 3, for 24 hours (Diagram 5, lower half).
A photographic plate taken from the same container (Diagram 6, above), which was furnished with one strip cut from the same aluminum sheet, was stored in the darkroom, packed in the same way.
Then I took a photographic Plate 2 from the same container, furnished it with aluminum bands from the same sheet, and fastened it 1 m over the water flowing in the canal at a rate of a meter every 3 seconds.
www.rexresearch.com /dobler/dobler.htm   (3219 words)

 History of Photography in Astronomy
After a photograph was taken on the plate, it was developed by exposing the plate to a current of magnesium vapor heated to a temperature of 75 degrees Celsius.
However, these early photographic plates were not sensitive enough to image faint objects.
This process produced a plate which had a much higher sensitivity than the early daguerrotypes, but it needed to be used as soon as it was made.
www.astro.virginia.edu /~afs5z/photography.html   (1822 words)

 Astrophotography.com: Astrophotoinfo   (Site not responding. Last check: 2007-11-07)
In the early part of the nineteenth century, Louis J. Daguerre created the first photographic plate, which was simply a thin film of polished silver on a copper base.
Once again astronomers were inconvenienced by the fact that wet plates had to be used immediately after they were produced, and although they had a higher sensitivity to light, the extra sensitivity came at a cost: the extra time and effort it took to have the plates ready to go for the night's observing.
Because photographic emulsions are made up of particles in suspension, this graininess cannot be completely eliminated and so at some level there will always be a loss of detail in taking a photograph.
www.astrophotography.com /info.htm   (1697 words)

This is borne out by the fact that ‘fluorographic plates and film in the flat’ for X-rays are specifically mentioned under tariff heading 37.01 while it is stated in the explanatory notes to tariff heading 37.02 that X-ray film in rolls is generally sensitised on both sides.
Fluorographic plates, film in the flat, instant print film of paperboard, offset duplicating masters and lithographic plates are categorised under tariff heading 37.01 and in some cases the subcategories are based on the thickness of the plate or film.
The reference to photographic plates would according to the respondent not have been necessary if plates or plate material was intended to be excluded from the term ‘photo-graphic film in rolls’.
www.taxnet.co.za /SATC/Vol62/15002001.HTM   (2698 words)

 Leander McCormick Observatory, Hall of Precision Astrometry - History of Photography
photographic plate, which was simply a thin film of polished silver on a copper base, sensitized by exposing the silver face to iodine vapors to form a thin yellow layer of silver iodide on the surface of the silver.
After a photograph was taken on the plate, it was developed by exposing the plate to a current of magnesium vapor heated to a temperature of 75° Celsius.
Photographic Amplification and Unsharp Masking, have allowed some of the lowest surface brightness objects to be discovered, including the giant low surface brightness spiral galaxy Malin-1 (at left).
www.astro.virginia.edu /~rjp0i/museum/photography.html   (2145 words)

 M. Blau "On the photographic effects of natural H-radiation "
The probe, enclosed in paraffin and absorption foils, was mounted on cardboard and covered by a thin iron plate with a gap of 0.5 mm width and 2.5 mm length (iron does not react with the photographic plate).
Opposite to the reacting side of the photographic plate, a glass plate with a spacing between the glass and the photographic plate of the thin cardboard was set up in the way that the radiation entered the space between the two plates.
An iron-tin plate E with a thickness of 0.4 mm is soldered at the lower side of the plate with the tilted gap and has a quadratic hole cut out in the middle with a side length of 1 cm.
www.physics.ucla.edu /~cwp/articles/blau/blau-rosenz.html   (4047 words)

 Drawing machines especially for integrated circuit masks - Patent 4110762   (Site not responding. Last check: 2007-11-07)
A photographic mask is accordingly made for this purpose and the zones of the photographic plate corrsponding to the intended diffusion locations are flened in said mask.
The photograph constituting the mask which is intended to form the integrated circuit or at least one of these stages is for example on a scale of 1:5 with respect to the real dimensions of the circuit to be formed.
In order to define the photograph as a whole, it is therefore necessary to displace the imager with respect to the photograph or to displace the photograph with respect to the imager ten times in the direction of the width and ten times in the direction of the length.
www.freepatentsonline.com /4110762.html   (4699 words)

While with X rays a strong impression is produced on a photographic plate in a few minutes or even by a single discharge, a day’s exposure to the uranium rays is required to produce a well-marked action, even though the uranium compound, enveloped in fl paper, is placed close to the plate.
The chief drawback of the photographic methods lies in the difficulty of deducing the intensity of the intensity of the radiation from measurements of the density of the photographic plate impression.
In many cases, the plate does become charged to a definite positive or negative potential depending on the metal, but this is due to the [199] contact difference of potential between the plates, and would be produced whether the rays were charged or not.
www.udayton.edu /~hume/Rutherford/rutherford.htm   (6027 words)

 Photographic plate - holography. The Columbia Encyclopedia, Sixth Edition. 2001-05   (Site not responding. Last check: 2007-11-07)
A Photographic Plate Spectrum of the Neutrons from the Disintegration of Lithium by Deuterons.
A >>photographic plate sits on the floor of an accelerating elevator; A photographic plate is in empty space, far from any gravitating >>masses.
photographic plate Photographic plates were one of the earliest forms of photographic film, in which a light-sensitive emulsion of silver salts was.
allbestlink.com /abl/photographic-plate.html   (220 words)

 [No title]   (Site not responding. Last check: 2007-11-07)
The photographic plates were scanned with the Yale PDS microdensitometer using the same procedure described in Bailyn et al.
The transformation from CCD coordinates to plate coordinates is linear, while the transformation from plate coordinates to equatorial coordinates is quadratic, and we used PPM proper motions to update the reference stars to the plate epoch.
The transformation that included the link between plate coordinates and ground-based CCD coordinates is about 0.013 arcsec, and it is mainly due to the measuring accuracy of the cluster stars on the plate in relation to the number of cluster stars used in the plate solution.
www.astro.yale.edu /dana/m4_astrom.html   (2419 words)

 Art for Industry's Sake   (Site not responding. Last check: 2007-11-07)
Ives's career as a photographic inventor began in 1873 when, at the age of 17, while working as an apprentice printer for a newspaper in Litchfield, Connecticut, he constructed a camera from a cigar box and spectacle lens so that he could experiment with the collodion wet-plate process.
The plate was then removed from the acid and the remaining emulsion washed off, revealing an image of the object's shadows etched into the plate and marked by the pattern of pits on its surface.
Photographers could only work in close proximity to their darkrooms; photographers who wished to work in the field had no choice but to tote their darkroom along with them.
dphillips.web.wesleyan.edu /halftone/chap1.html   (6358 words)

 First Photographic Plate in American Numismatics
It was his intention to make the plate as complete as possible by showing all the existing varieties in the best possible condition.
The 9 plates include 1 of colonial coins, two of half cents, and the rest are large cents.
Both sides of this cent (S15) appeared on the plate as 12 and K. In 1869 this was the only known example of this variety.
www.coinbooks.org /club_nbs_exhibit_2002.html   (1121 words)

 Photographic Plate Management
The large collection of these plates exceeded the drawer space and some groups of plates were stacked in boxes.
The wooden boxes emit gasses which are harmful to the photographic emmulsion and a part of the project is to move the plates to more inert archival boxes.
The volume required for each plate is increased as a result of this rehousing and the resulting boxes require either greater floor space or compact shelving.
www.astro.ucla.edu /~ulrich/MW_SPADP/Photographic_Plate_Management   (684 words)

 [No title]   (Site not responding. Last check: 2007-11-07)
The author examining a photographic plate with a measuring microscope.
The author's daughter examining a photographic plate with a measuring microscope.
This plate was taken with the coude' spectrograph of the Shane 3-meter Reflector.
herbie.ucolick.org /techdocs/tony/astronomy   (353 words)

 The 2006-2011 World Outlook for Prepared Photographic Plate Chemicals
It is for this definition of prepared photographic plate chemicals that the aggregate latent demand estimates are derived.
Based on the aggregate view of prepared photographic plate chemicals as defined above, data were then collected for as many similar countries as possible for that same definition, at the same level of the value chain.
Another way of looking at this is to say that latent demand for prepared photographic plate chemicals is more likely to be similar across countries that have similar characteristics in terms of economic development (i.e., African countries will have similar latent demand structures controlling for the income variation across the pool of African countries).
www.marketresearch.com /redirect.asp?productid=1111929&progid=3603   (2858 words)

 Photographic Plate Surveys at NOAO (1Dec95)
These surveys, as well as original plates obtained at the Kitt Peak telescopes, are stored in an environmentally controlled vault in the NOAO office building to preserve, as best as possible, the photographic emulsion.
Brief descriptions of the surveys follow: The Palomar Survey This is the survey completed in the 1950s with the Palomar Schmidt telescope, covering the sky in the declination range 0d to 90d in 894 fields, and the equatorial extension covering the declination range -15d to 0d in 287 fields.
We have a complete set of glass plates (both red and blue), which may be used by those needing the dimensional stability of the plates for astrometry.
www.noao.edu /noao/noaonews/dec95/art32.html   (642 words)

Previous to CCD astronomical imaging the astronomer would not be certain of the quality of his images prior to development of the photographic plate at which time the celestial positioning or the atmospheric conditions may not prove conducive for re-imaging.
Comparison of photographic plate size to CCD detector array size would indicate that there is an approximate 7.5 times larger plate size for the 3" x 5" photographic plate over the 36-mm x 36-mm CCD array size.
The larger photographic plate size provides for an image that captures a larger field of view of the object as compared to the imaged field that can be captured using the CCD camera.
www.cis.rit.edu /research/thesis/bs/2000/tuttle/Thesis.html   (3941 words)

 Re: freely falling photographic plate   (Site not responding. Last check: 2007-11-07)
A > photographic plate sits on the floor of an accelerating elevator; the > plate and elevator accelerate past the electron.
A photographic plate is in empty space, far from any gravitating > masses.
A photographic plate sits on the floor of an accelerating > elevator; the plate and elevator accelerate past the electron.
www.lns.cornell.edu /spr/2000-07/msg0027079.html   (235 words)

 Photographic Plate Making   (Site not responding. Last check: 2007-11-07)
Dry plates act by storing silver halide in a gel on the surface of a substrate, which is usually resin coated paper.
I then dried the plate under a blow dryer in the dark room and after a while the liquid emulsion turns into a smooth, white, reflective gel.
I exposed the plate on an enlarger to a random negative lying around for 7 seconds and placed it in the developer.
www.drbobguy.com /projects/photoplates/photoplates.shtml   (2008 words)

 photographic magnitudes of stars   (Site not responding. Last check: 2007-11-07)
Photography extended the range of observable magnitudes far beyond that of the eye, because in a time exposure a photographic plate can soak up light for hours on end, which the eye cannot.
Most astronomical photographs are taken on types of film that are not equally sensitive to light of all colors.
refers to a photographic magnitude that has been measured using photographic plates whose sensitivity to various colors is similar to that of the human eye.
www.sizes.com /units/magnitude_photographic.htm   (187 words)

 The American Experience | The Wizard of Photography | People & Events | The Daguerreotype is Invented
When he began producing positive prints from the original plates, he was able to obtain longer-lasting images, but the results were still crude.
In 1835 he placed his plates in a cabinet, not knowing that a container of mercury had a leak in it and was emitting vapor into the enclosed space, thus creating the first daguerreotype.
The photograph, we consider to be the grand climacteric of the science.… It has been said that the inhalation of exhilarating gas is a powerful artificial agent for disclosing weaknesses of human nature.
www.pbs.org /wgbh/amex/eastman/peopleevents/pande10.html   (788 words)

 Discovery of Radioactivity: Becquerel
One wraps a Lumière photographic plate with a bromide emulsion[7] in two sheets of very thick fl paper, such that the plate does not become clouded upon being exposed to the sun for a day.
I did the same with the case closed by a plate of aluminum in which I put a photographic plate and then on the outside a crust of the uranium salt.
The photographic plates at the time contained silver salts (silver bromide, AgBr, for example), which are sensitive to light.
web.lemoyne.edu /~giunta/EA/BECQUERELann.HTML   (2590 words)

 The MMO Photographic Plate Archive   (Site not responding. Last check: 2007-11-07)
More than 8,000 registered photographic plates were obtained with this instrument in the period from 1913 to 1995.
Although the total number of plates in the MMO plate archive is relatively small, it may be one of the richest collections of the plates for these three regions of the sky.
Three image files (about 700 MB in total) were burned on a CD for each 8x10 inch plate - the overview scan of the whole plate with resolution of 840 dpi, and two high-resolution (2,500 dpi) scans of the western and eastern halves of the plate (with some overlap).
www.skyarchive.org /archives/MMO.html   (516 words)

 Photographic Plate Sensitization: Baking in Forming Gas   (Site not responding. Last check: 2007-11-07)
PLATE CUTTING (if needed): After the plates have warmed, the plates may be cut to desired size with room lights off.
Alternativly, the plates may be transferred to Kodak boxes in the plate loading room for easy transport to any telescope.
Unused plates should be returned to a deep freeze as soon as possible (refrigerator at telescope or the freezer room).
mthamilton.ucolick.org /techdocs/techref/photography/baking.html   (2233 words)

Try your search on: Qwika (all wikis)

  About us   |   Why use us?   |   Reviews   |   Press   |   Contact us  
Copyright © 2005-2007 www.factbites.com Usage implies agreement with terms.