Joseph Fraunhofer: Dispersion

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Joseph Fraunhofer: Dispersion
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Joseph Fraunhofer: Dispersion
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W 1590
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Rensselaer Polytechnic Institute, Office of Instructional Media

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Film, 16 mm, LT, MT, 151 m ; F, 14 min

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Wiederholung historischer Experimente Fraunhofers mit Geräten aus dem Deutschen Museum, München: Aufzeichnung Fraunhoferscher Linien, Brechung optischer Gläser, Präzisionsspektrometer zur Aufzeichnung von Brechungsindices und Dispersionen, Verwendung achromatischer Linsen für Mikroskope und astronomische Fernrohre; historischer Rückblick.
The uses to which Fraunhofer put the dark lines in the spectrum of sunlight are explained. He charted the dispersive powers of optical glass he had perfected. He designed and constructed the finest achromatic lenses and optical instruments, including refraction telescopes. Explores some of these telescopes.
Keywords Fraunhofer, Joseph von Spektroskopie Fraunhofer-Linien Dispersion Beugung Absorptionsspektrum absorption spectrum diffraction dispersion Fraunhofer lines spectroscopy Fraunhofer, Joseph von
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Speckle imaging Camera lens Sunlight Order and disorder (physics) Screen printing Light
Clock Series and parallel circuits Sunlight Day Hochbahn Astronomisches Fenster AM-Herculis-Stern Ground (electricity)
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Angle of attack Roll forming Cut (gems) Measuring instrument Glass Power (physics)
Optics Typesetting Speckle imaging Crown (headgear) Hour Brechung Theodolite Glass Slip (ceramics) Ring strain Ground (electricity)
Weather front RSD-10 Pioneer Silvering Year Arc lamp
Hot working Quality (business) Dud Sunlight Measurement Absorbance Spring (season) Crown (headgear) Measuring instrument Radiation Spaceport Video Nanotechnology Atmosphere of Earth Material Pink Optics Paper Camera lens Refractive index Power (physics) Microscope Angle of attack Standard cell Chromatic aberration Pager Glass Noise figure Water vapor Workshop Ground (electricity)
Camera lens Foot (unit) Terrestrial planet
Line-of-sight propagation Hochbahn Star
Planet Hot working Astronomer Hour Year Refracting telescope Star
Transmission (mechanics) Foot (unit)
Prozessleittechnik Aperture Gentleman Camera lens Sunlight Visible spectrum Video Glass
In the end of the year you know
you the government is it was
the only way to reach an the
son of the right of the letter but
I know further Georgia
we've been adjusting a hideous that in order to bring some light in here instead of being the lens produces a fixed image of the sun at the point where I'm placing the screen the mayor on making
stack is driven by a clock
it rotates about this axis which we have carefully said parallel to to the polar axis of York the mayor follows the sun it is said to account for 2 days elevation of the sign above the the horizon in such a way that it rays from the sun parallel to the polar axis of the earth regardless of the time some of the reflected sunlight is intercepted by a fixed near behind the window in the parish schools too and is sent down for
another reflection and its lower end which brings the sunlight into the lap I had here before but let me put it back what we have here now
is the president's spectacle where the continuing is interrupted by many dark lines of varying thickness and intensity they're all parallel to the slip and signify the absence of slick images over various narrow wavelength bands this exposure was made on 1 of the common color the I can't see the range indicated commercial color films are insensitive to the Red about 60 800 Angstrom units but the I responded to intense light up to 70 600 extra sunlight of course it's quite intense With infra-red sensitive color film The invisible red portion and even some of the invisible infrared light exposes a threat we are not showing you the remainder of the spectrum 60 800 Angstrom as exposed on this emulsion because it misrepresents the colors in that range it is a composite of the 2 exposures the dark lines in the spectrum of the sun were 1st studied in detail by Joseph from all over and are named for him by his own account he saw 574 lines between here and here our knowledge of the spectrum has been greatly extended since Randolph tens of thousands of rounds 4 lines have been recorded the most prominent dark lines have been assigned the study of the spectrum by Prime Mover was by no means is only scientific work but it is interesting to note but the more prominent of these lines being a major role in all his other work as reference marks this outstanding experimental scientists produced the finest quality optical glass the world had seen up to his time His lenses approach protection it was the optical industry on a scientific basis and what's more he constructed the 1st high-quality diffraction grating ground offers life was spending on University of Munich in that area we took a trip there
because a number of his original instruments and samples of preserved their
most of them in a large Museum of Science and Technology the German museums this is a sample of lesser which from over cut from some of his experimental it is actually 2 samples from 2 different male Polish to form dual prism of common angle he used it to compare the refractive and present powers of 2 different glasses the prison in the middle
is made of ground less it's like going due to iron impurities but quite uniform optically and drink from internal strain the 2 others on the grass reddish-brown because the Red oxide of led was a major ingredient for this type of optical lab I think glass has higher refractive intersperses hours than crown From over modified a surveyors
theodolite into the 1st provisions that commentary in the history of he published the telescope on a narrow vertical slip this led very far away from home the not used ,comma meeting when image with centered on the intersection of the cross hairs in the eye here
and the telescopes on a protracted which was ruled on a silver circle it has tarnished over the years the pioneer in Malaysia ,comma
accuracy of 10 seconds of arc next the prison was placed on the table in front of the telescope both the president
and the telescope return until 1 of the dark clients in the solar spectrum was involved in minimum deviations and on the cross hairs of the on then the telescope's new angular position could be read on the burning of protected from the angle of minimum deviation Delta for shade from overlying air he could calculate the index of refraction end of which is has for this radiation but only if he also knew the value of the index angle of his prison he found value by using his telescope in the afterlife the same accuracy with which Delta next the measure Delta for a number of different from all the lines using the same prison then he went on to do this Prince he charted during practice and this interspersed powers of optical materials From over his personal notes are preserved in the library of the German museums on 1 of the pages tabulates refractive indices for example thing another crown last 4 water each column sites of value for a given monochromatic light red had less to do it right 6 of the dangers are significant figures he published an important article on the solar spectrum the dispersion of glass and the grammatical lenses there's not enough time to describe all the experiments from discusses his epoch-making paper that just say that his precise values for the dispersion of Clinton crown last led him to design and then to produce a chromatic lenses is of the highest quality he changed making into a science he was a gifted draftsman and engraver the place from which this picture was struck wasn't great by him for his own use In watercolors this spring this government has a diameter of 24 centimeters that's 9 and a half inches 1 discipline and diverging the 2nd Crown and converging each of the port services are ground to a different radius of curvature the Lansbury
said that the pre-calculated spacing not all lenders coming from from workshop where large nor did he confined himself to the production of lenses he designed entire optical instruments this is 1 of his big chromatic microscope such instruments were available for sale from the firm at which all his work was done and in which
became 1 of the partners this is 1 of them theodolite this pocket-sized nesting
telescope but terrestrial for example is an offer that was engraved by from over and presented to a grand during his brief lifetime however he reached his greatest fame of the astronomical telescopes he made the 2 is about 14 feet long Everything in this telescope designed by from the lenses as well as the mouse the actually said
precisely parallel to the axis of the With this meal and protracted the optic axis of the telescope can be sent to the elevation of the star above the horizon and the innovation can be measured with precision the polar axis is driven by ideas by a
self-regulating gravity Clark so the telescope can follow a star once in the
intersection of the cross hairs of the eyepiece a stars stayed there for hours even at high magnification the planet Neptune was discovered
through his telescope a telescope of similar dimensions was sent by problem over and his firm who will have to prove it a great astronomer who work in Russia who's going this work it became the most famous telescope of the time it is not known but it still exists Crownover died in the year in 1826 when he was 39 years old at that time he was designing even larger telescopes In the year 1847 a large refracting telescope built in Munich by from successes in the same firm was sent to Cambridge Massachusetts for use at Harvard College it is still there
today on its original granted it has the characteristic from will amount although the gravity Clark has been replaced by by an electric drive it is over
20 feet long it is occasionally used for astronomical
observations even today the
telescope is so well balanced that it can easily be turned by hand the aperture of the lenses is 15 inches probably began by studying the dispersion of optical glass which he had protected himself In the process he discovered the dark lines in the spectrum of the sun so when was making the best optical lenses the world has ever seen With this film we honor the man who founded the scientific optical industry


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