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16:50 IWF (Göttingen) Silent film 1963

Oberharzer Erzbergbau um 1920 - 1. Der Bergbau

The film covers the first part of an three-part film on the Upper harz ore mining industry, shot in 1923. It begins with shots of the hydroeconomic drain an dpond system, and of the shaft system "Silbersegen", conveyance of which was done with one water wheel up to 1931 and of the modern installed shaft "Kaiser-Wilhelm-II". Then follows the "conveyance" of the miners in the Kaiser-Wilhelm shaft, with a brief view of the hydraulic head machine in this shaft and of the power generating plant in the Ernst-August gallery. Winning and conveyance underground are then shown in detail: long-distance conveyance in closed trains with electric trolley locomotives, winning of the crude or by drilling and blasting and removal to the tubs, which are brought to the surface in the cage.
  • Published: 1963
  • Publisher: IWF (Göttingen)
  • Language: Silent film
13:47 IWF (Göttingen) Silent film 1963

Oberharzer Erzbergbau um 1920 - 3. Die Verhüttung

The film covers the third part of an, originally, three-part film on the Upper Harz ore mining industry, shot in 1923. Here we see the smelting in the Frankenscharrn smelting plant in Clausthal, which was first operated in 1554; first step is the roasting and desulphurization of the ore concentrates in a one-story rotary furnace with subsequent dead-roasting and sintering in a converter. The roasting charge is then smelted in blast-furnaces with lateral gas exhaust. We are also shown the slag tapping and, finally, the lead tapping. In addition to the silver-bearing lead, which is cast in bars, copper-bearing compounds are also won.
  • Published: 1963
  • Publisher: IWF (Göttingen)
  • Language: Silent film
14:05 IWF (Göttingen) Silent film 2007

Mausohrfledermaus

The DVD contains the IWF-films: E 1837 "Glossophaga soricina (Phyllostomatidae) - Ingestion of Food (Licking)"; E 1838 "Glossophaga soricina (Phyllostomatidae) - Flight in Place"; C 1094 "Biology of the Mouse-eared Bat (Myotis myotis)"; E 1631 "Myotis myotis (Vespertilionidae) - Birth"; C 884 "Sensory Abilities of the Bat Myotis myotis Taking up Food from the Ground".
  • Published: 2007
  • Publisher: IWF (Göttingen)
  • Language: Silent film
08:54 Institut für Film und Bild in Wissenschaft und Unterricht, Abteilung Hochschule und Forschung (Göttingen) Silent film 1950

Beutefang bei der Kreuzspinne

Catching as the sum of single stimuli and reactions following an internal automatism: approaching the prey (vibrational stimulus), touching with its palps (tactile stimulus), spinning, biting (chemical stimulus), removal from the web and transport to the look-out. Different experiments on stimulus analysis.
  • Published: 1950
  • Publisher: Institut für Film und Bild in Wissenschaft und Unterricht, Abteilung Hochschule und Forschung (Göttingen)
  • Language: Silent film
04:27 Institut für Film und Bild in Wissenschaft und Unterricht, Abteilung Hochschule und Forschung (Göttingen) Silent film 1950

Orientierungsvermögen bei der Kreuzspinne

Orientation of the garden spider by means of gravitational direction. Experiments on the retrieval of the web centre after return from the periphery. Experimental proof of memory assistance in catching.
  • Published: 1950
  • Publisher: Institut für Film und Bild in Wissenschaft und Unterricht, Abteilung Hochschule und Forschung (Göttingen)
  • Language: Silent film
07:38 IWF (Göttingen) Silent film 1965

Tilapia heudeloti (Cichlidae) - Balz

Senegal cichlid. Female performing the courtship display: impressing, tail beating, "bowing" before the congener. The male stays with the female digging the spawning ground. Both partners in preparation of spawning.
  • Published: 1965
  • Publisher: IWF (Göttingen)
  • Language: Silent film
12:05 IWF (Göttingen) Silent film 1969

Schwungstemmen im Übungsverbindungen am Reck

Using general views and close-ups, the film shows the backward uprises in short exercise combinations on the high-level horizontal bar. The documentation of the individual exercise combination, perfectly performed, filmed at normal speed and with various slow-motion effects, from oblique and axial angles, aids the illustration and analysis of the course of movement.
  • Published: 1969
  • Publisher: IWF (Göttingen)
  • Language: Silent film
01:28 Bundesanstalt für Wasserbau (BAW) Silent film 2013

Odermodell Zeitraffer - Schrägansicht

Experiment über etwa 6 Stunden, instationär, mit Durchgang einer mittleren Hochwasserwelle. Aufnahme entgegen der Fließrichtung, Schrägansicht.
  • Published: 2013
  • Publisher: Bundesanstalt für Wasserbau (BAW)
  • Language: Silent film
07:09 IWF (Göttingen) Silent film 1975

Glossophaga soricina (Phyllostomatidae) - Flug auf der Stelle

The film shows slow motion takes of the hovering flight of a glossophagine bat whirring on the spot while licking honey water from a pipette. The kinematics of the hovering flight can be observed in takes from the side, from above and from the front. The downward beat of the wings takes place with out-stretched, spread wings with a considerable inclination to the airflow. During the upward sweep a functional division of the wings takes place: the arm part is gathered and led up with little air resistance, the hand is turned sharply so that its morphological upper side receives a positive inclination angle relative to the oncoming airflow. In this way lift may be produced in the upward as well as the downward movements.
  • Published: 1975
  • Publisher: IWF (Göttingen)
  • Language: Silent film
Offline Collection IWF (Göttingen) Silent film 1980

Saprospira grandis (Leucotrichales) - Wachstum und Bewegung

The multicellular, screw-shaped filaments move by gliding, the srews rotating at the same time around their long axis. When Saprospira grows under spatial confinement, it forms long uncoiled filaments, which are no longer able to glide. However, as small particles that stick to the surface of the filaments still travel back and forth along the filaments, the machinery for movement must still be partially intact. Within the colony the bacterial filaments tend to align parallel to one another, with the screws exactly "in phase". The colony thus acquires a regular pattern of stripes.
  • Published: 1980
  • Publisher: IWF (Göttingen)
  • Language: Silent film
Offline Collection IWF (Göttingen) Silent film 1980

Herpetosiphon giganteus (Leucotrichales) - Wachstum und Bewegung

Multicellular filaments glide across an agar surface. They leave mucus traces behind. Lucid translucent pieces in some filaments are "necrotic bodies" (dead and empty cells). As a result of its gliding, the colony (swarm) spreads rapidly. Filaments can gather and form a ball at arbitrary locations in the swarm.
  • Published: 1980
  • Publisher: IWF (Göttingen)
  • Language: Silent film
01:05 IWF (Göttingen) Silent film 1976

Flug auf der Stelle - Blütenbesuchende Fledermaus (Glossophaga soricina)

Hovering in place, seen from the side, from above and from the front. With slow motion.
  • Published: 1976
  • Publisher: IWF (Göttingen)
  • Language: Silent film
01:33 Bundesanstalt für Wasserbau (BAW) Silent film 2013

Havarie TMS Waldhof - Visualisierung der 3D-Berechnungsergebnisse zur Kenterung des TMS Waldhof

Um den Einfluss der dreidimensionalen Strömung auf den Schiffskörper in unmittelbarer Interaktion mit dem dynamischen Verhalten der Ladung in den Tanks bewerten zu können, wurde das 3D-HN-Strömungsmodell um ein dreidimensionales geometrisches Modell des TMS Waldhof, in dem auch die Tankgeometrien berücksichtigt sind, erweitert. Diese Untersuchungen haben gezeigt, dass die aus den Berechnungen ermittelten krängenden Momente im Bereich der roten Fahrrinnenbegrenzungstonne bei Rhein-km 553,75 zum Kentern des TMS Waldhof führen. Das Video präsentiert zeitgleich das TMS Waldhof mit Sicht in die Tanks und auf das schiffsinduzierte Wellenbild aus der Vogelperspektive hinter dem Schiff, sowie die Druckverteilung am Unterwasserschiff des TMS Waldhof (Unterwasserperspektive hinter dem Schiff) und die Wasserspiegellagenänderung bezogen auf 71,5 m+NN mit den Fahrrinnenbegrenzungstonnen zur Orientierung. Eine vom Bundesministerium für Verkehr, Bau und Stadtentwicklung (BMVBS) eingesetzte interdisziplinäre Expertengruppe hat den Ablauf der Havarie des TMS Waldhof am 13. Januar 2011 auf dem Mittelrhein nahe der Loreley eingehend untersucht und konnte die Ursachen für das schwere Schiffsunglück aufklären. Der vollständige Untersuchungsbericht „Bericht über den Ablauf und die Ursachen der Havarie des Tankmotorschiffes „Waldhof" am 13. Januar 2011 auf dem Mittelrhein (Rhein-km 553,75)" ist im Internet unter www.elwis.de, dem ELektronischen Wasserstraßen-Informations-Service (ELWIS) der Wasser- und Schifffahrtsverwaltung des Bundes als Download eingestellt. Weitere Informationen stehen zum Download bereit unter: http://www.baw.de/de/presse/pressekonferenzen/index.php.html
  • Published: 2013
  • Publisher: Bundesanstalt für Wasserbau (BAW)
  • Language: Silent film
01:54 Bundesanstalt für Wasserbau (BAW) Silent film 2013

Havarie TMS Waldhof - Visualisierung der Strömungsverhältnisse zum Zeitpunkt der Havarie

Im Rahmen der Untersuchung der Ursachen der Havarie des TMS Waldhof am 13.01.2011 auf dem Mittelrhein wurden in der immersiven Visualisierungsanlage der BAW das Sichtmodell der Gebirgsstrecke, das Modell des TMS Waldhof sowie die Berechnungsergebnisse des dreidimensionalen Strömungsmodells zusammengeführt. Dargestellt wird die komplexe Strömungssituation bei dem Hochwasserabfluss, wie sie in der Nacht der Havarie vorlag. Das Video zeigt exemplarisch aus verschiedenen Perspektiven das TMS Waldhof etwa bei Rhein-km 553,7 im Bereich der roten Fahrrinnenbegrenzungstonne. Die differenzierte Analyse der 3D-Strömung im Bereich der Loreleystrecke belegt, dass hier die Navigation mit einem Schiff anspruchsvoll ist. Die Strömungsverhältnisse bewirken je nach Abfluss und Position ungleichmäßige hydraulische Belastungen auf ein Schiff. Die Untersuchungen mit dem Strömungsmodell zeigen, dass etwa bei Rhein-km 553,7 im Bereich neben der roten Fahrrinnenbegrenzungstonne Strömungen existieren, die für einen Talfahrer ein krängendes Moment in Richtung Steuerbord erzeugen. Eine vom Bundesministerium für Verkehr, Bau und Stadtentwicklung (BMVBS) eingesetzte interdisziplinäre Expertengruppe hat den Ablauf der Havarie des TMS Waldhof am 13. Januar 2011 auf dem Mittelrhein nahe der Loreley eingehend untersucht und konnte die Ursachen für das schwere Schiffsunglück aufklären. Der vollständige Untersuchungsbericht „Bericht über den Ablauf und die Ursachen der Havarie des Tankmotorschiffes „Waldhof" am 13. Januar 2011 auf dem Mittelrhein (Rhein-km 553,75)" ist im Internet unter www.elwis.de, dem ELektronischen Wasserstraßen-Informations-Service (ELWIS) der Wasser- und Schifffahrtsverwaltung des Bundes als Download eingestellt. Weitere Informationen stehen zum Download bereit unter: http://www.baw.de/de/presse/pressekonferenzen/index.php.html
  • Published: 2013
  • Publisher: Bundesanstalt für Wasserbau (BAW)
  • Language: Silent film
01:37 Bundesanstalt für Wasserbau (BAW) Silent film 2013

Odermodell Zeitraffer - Senkrechte Ansicht

Experiment über etwa 6 Stunden, instationär, mit Durchgang einer mittleren Hochwasserwelle. Aufnahme senkrecht von oben.
  • Published: 2013
  • Publisher: Bundesanstalt für Wasserbau (BAW)
  • Language: Silent film
03:55 IWF (Göttingen) Silent film 1972

Kristallumwandlung - Temperaturgesteuerte Strukturveränderung in Vanadiumdioxid-Einkristallen

At a critical temperature of 65,5°C, vanadium oxide crystals exhibit a structural transformation which is associated with a semiconductor-to-metal transition. The double-refractive, low-temperature phase is split up into differently oriented domains which can be rendered visible under a polarization microscope. Filmed through such a microscope, the film shows the transitions between semiconducting and metallic phases of vanadium oxide monocrystal needles. The transformations are caused by the external application of heat or by current flow with defined angles resulting between the domain walls and the crystal axes. In the case of current passing through the crystals there are, in addition, domain migrations which are due to the Peltier Effect and depend upon the direction of the current flow.
  • Published: 1972
  • Publisher: IWF (Göttingen)
  • Language: Silent film
08:23 IWF (Göttingen) Silent film 1970

Umwandlung des Zinns - Fortschreiten der Umwandlungsfront

Transformation of white into grey tin at experiment temperatures of approx. -25°C and reconversion at approx. +20°C. Formation of the transformation front. Demonstration of the deformations, which result during the growth of grey or white tin. Front form along one grain boundary. With time-lapse.
  • Published: 1970
  • Publisher: IWF (Göttingen)
  • Language: Silent film
02:11 IWF (Göttingen) Silent film 1983

Plasmolyse - Allium cepa

Epidermal cells of the onion. Playsmolis of cells in 1 mole glucose solution, deplasmolysis after supply of water. Convex plasmolysis in hypertonic KCl- solution, concave plasmolysis in hypertonic CaCl[2]-solution. Hecht's threads in high magnification. Time-lapse.
  • Published: 1983
  • Publisher: IWF (Göttingen)
  • Language: Silent film
02:47 IWF (Göttingen) Silent film 1981

Apodemus flavicollis (Muridae) - Jungentransport

The film shows a Yellow-necked Field Mouse smoothing the soil in its subterranean nest. It carries a leaf into the nest and has a young suckled. Not only the young of its own but also a white mouse lying outside of the subterranean hole are carried into the nest. The female grasps the small animals with her teeth at the skin of their belly, back or their flank, carriest them one after the other to the entrance of the hole and puts them into it. In the subterranean passage the mother takes up the young which kept motionless with their extremities and tail fixed to their body ("Tragstarre"). She carries or drags them to the stuffed nesting cave.
  • Published: 1981
  • Publisher: IWF (Göttingen)
  • Language: Silent film
10:25 IWF (Göttingen) Silent film 1972

Erstarren von Metallschmelzen - Kristallisation der Aluminium-Silizium-Legierungen AlSi 18 und AlSi 12,5

The crystallization process of aluminium-silicon alloys is observed and filmed through a high-temperature microscope. The film shows the growth of primary silicon crystals in hyper-eutectic melts under slow and rapid cooling and with doping of melt with phosphorus. The eutetic reaction which concludes solidification is also shown, and investigated further, at varying cooling rates in the subsequent sequences. Solidification of an aluminium-silicon alloy modified by sodium salts addition, whose crystallization behaviour is comparable to that of a rapidly cooled unmodified alloy, concludes the film.
  • Published: 1972
  • Publisher: IWF (Göttingen)
  • Language: Silent film
04:39 IWF (Göttingen) Silent film 1950

Kreislaufstudien an Herz und großen Venen (Tierversuche)

Ventricular movements, blood flow in heart cavities and heart vessels (slow motion x-ray cinematography).
  • Published: 1950
  • Publisher: IWF (Göttingen)
  • Language: Silent film
03:40 IWF (Göttingen) Silent film 1950

Kreislaufstudien an Herz und großen Arterien (Tierversuche)

Change of shape of heart cavities, blood flow in aorta, larges arteries, large veins and heart (slow motion x-ray cinematography).
  • Published: 1950
  • Publisher: IWF (Göttingen)
  • Language: Silent film
05:47 IWF (Göttingen) Silent film 1983

Kristallumwandlung - Lamellenstrukturen beim Verdampfen von Kaliumchlorid-Einkristallflächen

The thermal history of a crystal plays a very important part in the visual and electrical examination of alkali halides. For this reason, crystal surfaces are examined at high temperatures. During evaporation in air the fracture planes show characteristic changes. Thus, below the melting point of 770°C, various surface structures are observed. Rectangular lamella structures form within narrowly defined temperature ranges below 720°C. Between 720°C and 740°C intermediate structures occur and circular lamella structures appear between 740°C and 770°C. The observations were carried out with the aid of a phase contrast microscope. The micro-cinematographic exposures were made using time lapse photography with ratios of 3:1 to 144:1.
  • Published: 1983
  • Publisher: IWF (Göttingen)
  • Language: Silent film
07:42 IWF (Göttingen) Silent film 1967

Rostbildung auf Reineisen - Anfangsstadien

The film shows the initial stages of rust formation on a polished surface of pure iron at microscopic magnifications. The experiments were made in an atmosphere of 75 per cent relative humidity with small additions of hydrochlorid acid acting to accelerate corrosion. Using the fast motion technique it is possible to observe the individual stages of rust formation: First, corrosion points occur which, as corrosion proceeds further, grow into filament-type shapes spreading all over the iron surface. In some instances, the dependence of the direction of filament growth on the polishing direction can be observed. Also, scratches on the metal surface display a greater affinity to corrosion in some places.
  • Published: 1967
  • Publisher: IWF (Göttingen)
  • Language: Silent film
03:39 IWF (Göttingen) Silent film 1973

Desmidiaceae - Fortbewegung durch Schleimausscheidung

Single-cell desmids including Micrasterias denticulata, Pleurotaenium truncatum, Euastrum oblongum and Closterium lunula move in fresh-water detritus by secreting mucus. After secretion the mucus swells, thereby pushing the cell.
  • Published: 1973
  • Publisher: IWF (Göttingen)
  • Language: Silent film
11:11 IWF (Göttingen) Silent film 1973

Mittelchile, Küstenkordillere - Gewinnung von Palmhonig im Ocoa-Tal

In the spring (August) agricultural workers fell a few selected honey palms (Jubaea chilensis (Mol.) Baillon). These then remain lying down until October when the palm sap has matured in the trunk. Then the palm crown is carefully removed, the tip of the trunk is cut open with a sharp knife and then bound together so that it does not burst open in the heat or when dry. A container placed underneath catches the palm sap dripping down. The place where it is cut and the container are covered. The workers collect the palm juice twice a day from their base camp (bodega). The dripping places also have to be cut open every day. In the bodega yard the sap is evaporated until it becomes a syrup, it is sieved and then filled into smaller vats. Twice a week the thickened palm honey is transported by horse or mule to the canning factory down the valley, where it is thinned with sugared water and filled into cans. To protect one of the last remains of the honey palms, the obtaining of honey in the Ocoa valley has been stopped.
  • Published: 1973
  • Publisher: IWF (Göttingen)
  • Language: Silent film
01:57 Reichsanstalt für Film und Bild in Wissenschaft und Unterricht (RWU) Silent film 1937

Der Drehkegel

Darstellung in senkrechter Axonometrie, Darstellung eines Doppelkegels mit Geradenschar als Erzeugende im Aufriß, Schnitte des Kegels mit Ebenen senkrecht zur Aufrißtafel, wobei die Ebenen um eine Achse gedreht werden: Hyperbel, Parabel, Ellipse, Kreis.
  • Published: 1937
  • Publisher: Reichsanstalt für Film und Bild in Wissenschaft und Unterricht (RWU)
  • Language: Silent film
00:05 Copernicus Publications Silent film 2016

Five model structures

  • Published: 2016
  • Publisher: Copernicus Publications
  • Language: Silent film
02:02 IWF (Göttingen) Silent film 1988

Scheinkonturen und Isoluminanz

Subjective contours (cognitive contours) are either interpreted as extraordinary cases of figure-ground-organisation or as effects of visual depth stimuli. They are no primary contrast effects, yet become clearly visible - like objective contours - only under the condition of a brightness contrast between figure and ground. Under the conditions of contrast and isoluminance the film shows: Heckhausen pattern, Kanisza triangles, subjective Necker's cube, Brunswik letters. (see Gregory 1972).
  • Published: 1988
  • Publisher: IWF (Göttingen)
  • Language: Silent film
01:44 IWF (Göttingen) Silent film 1988

Rotierender Baukran

A rotating building crane (standing not too close to the spectator) is a modern pendant of Porterfield's windmill (film K 115). In both cases the depth clue of relative size is deleted by parallel projection. Regarding the crane the motion direction can be observed by means of remaining depth clues, especially of occlusion (model shots).
  • Published: 1988
  • Publisher: IWF (Göttingen)
  • Language: Silent film
01:08 IWF (Göttingen) Silent film 1988

Bewegungsumkehr und Trapezgestalt II

Ames' window as a trapezium is the projection of a rectangle in linear perspective. Like the set of open spanners in film K 133 different flat objects can be composed as a trapezium. Whereas the row of open spanners can possibly be interpreted as one object this does not apply here. Nevertheless apparent motion reversal occurs. (Kalkofen 1987).
  • Published: 1988
  • Publisher: IWF (Göttingen)
  • Language: Silent film
01:44 Leibniz Universität Hannover (LUH), Institut für Meteorologie und Klimatologie Silent film 2015

Non-Cyclic Turbulent Inflow

The animation shows a comparison between two large-eddy simulations (LES) using different inflow boundary conditions. For both simulations the LES model PALM was used, simulating a neutral stratified flow over an array of building cubes. The upper half of this visualization shows a simulation, which uses a laminar inflow at the left boundary while the lower half shows a simulation, which uses a turbulence generator based on a filter method at the left boundary. The size of both domains is 2180m x 720m x 240m with a mean background wind of 6 m/s at the top of the domain blowing from left to right. The rotation of the velocity vector (absolute values) is visualized to show the turbulence structures and intensities. High values are marked red while low values are white. The buildings have a cubic shape with 24m edge length and are packed with a plane area index of 0.25. One tall building sits in the center of the domain with three times the size of a small building in horizontal direction and four times the size in vertical direction. The animation was created using the visualization software VAPOR. Simulations were calculated on the Cray-XC30 of the North-German Supercomputing Alliance as well as on the TSUBAME 2.5 of the Tokyo Institute of Technology. In the simulation with laminar inflow (top), first turbulent motions can be spotted behind the tenth building row. In reality such a laminar flow is almost never observed and hence very artificial. In the simulation with generated turbulent inflow (bottom), turbulence is created at the inflow boundary. This leads to an already turbulent flow above the first building rows. This flow is much more realistic. The flow in close vicinity to the tall building at the center of the domain shows slight differences between the two simulations. These differences can especially be seen at the rooftop of the tall building. Here the arriving flow in the top simulation shows almost no developed turbulence, while the arriving flow in the bottom simulation is already turbulent. At the outflow boundary however, both simulations show nearly equally developed turbulence. The results indicate, that the used turbulence generation method allows legitimate analysis of simulation data much closer to the inflow boundary which can result in significant cost savings due to smaller required domain sizes.
  • Published: 2015
  • Publisher: Leibniz Universität Hannover (LUH), Institut für Meteorologie und Klimatologie
  • Language: Silent film
02:40 Leibniz Universität Hannover (LUH), Institut für Meteorologie und Klimatologie Silent film 2015

Airport Area Large-Eddy Simulation

The animation displays the influence of airport-building induced turbulence on an aircraft during a crosswind landing. The animation data were derived using the parallelized large-eddy simulation model PALM, simulating a neutrally stratified flow over an artificial building, with a mean flow from the west (perpendicular to the obstacle and the runway) and a free stream wind of 20 m/s. Visualized is the crosswind variation as difference between the instantaneous and the mean wind field, with positive values in red and negative values in blue. The building is 25 x 250 x 40 m³ (length x width x height) and displayed in white. The animation spans over 9 minutes with parts accelerated by a time-lapse factor of 5, and was created with the visualization software VAPOR. The total PALM model domain had a size of 4 x 2 x 2 km³ in streamwise, spanwise and vertical direction. The displayed domain extends over 500 x 1000 x 200 m³. During the last 20 seconds of the simulation, the crosswind variation encountered by the aircraft during its final approach is tracked and dispalyed on the flightpath of the aircraft as well as in a temporal history plot in the lower left corner of the screen. The aircraft has a ground speed of 70 m/s. Its flightpath is 450 m downstream from the building. The airport building generates strong turbulence with resulting crosswind variations of up to 10 m/s. The aircraft encounters these strong crosswind variations within a few seconds. During the flight, the crosswind drops from more than 15 m/s down to almost 0 m/s. The animation can be divided into two major parts. The pre-flight part of the animation starts with an aerial view onto the entire airport area and shows several perspectives of the scene with slow camera moves. The flight part shows the final approach of the aircraft.
  • Published: 2015
  • Publisher: Leibniz Universität Hannover (LUH), Institut für Meteorologie und Klimatologie
  • Language: Silent film
02:08 IWF (Göttingen) Silent film 1988

Lehmann-Liebmann-Effekt

Alfred Lehmann (Copenhagen, 1904) used isoluminance to test the irradiation theory of geometrical optical illusions; Susanne Liebmann (1927) demonstrated the disturbance of figure-ground differentiation in isoluminance. Variation of the figure-ground contrast with a lacy silhouette (by Lotte Reiniger), Münsterberg's "displaced chess piece", Zöllner's pattern, Frazer's spiral, Frazer's chessboard pattern.
  • Published: 1988
  • Publisher: IWF (Göttingen)
  • Language: Silent film
01:14 IWF (Göttingen) Silent film 1988

Bewegungsumkehr und Textur

Wherease film K 151 demostrates how the rotating silhouette of an image with detailed inner contours constructed in central projection induces - as the image itself - apparent motion reversal, this film shows that an occlusive texture "isolatedly" induces similar phenomenons. Both templates are composed of telecentric images of a red/white ringed double cone. Template A (on the left) shows it equally oriented on both sides (red tip); template B shows alternative orientations (red tip, white tip). (Kalkofen 1982).
  • Published: 1988
  • Publisher: IWF (Göttingen)
  • Language: Silent film
02:07 IWF (Göttingen) Silent film 1988

Simulation von Körperfarben

Surface colour and (mono- and polychrome) illumination or shadowing can substitute each other: a white module construction looks in the front projection of a slide of a similar construction made of coloured modules nearly like the latter. It is also demonstrated that polar projection is no question of "symbolic form". Finally a variation of Hering's spot-shade-experiment.
  • Published: 1988
  • Publisher: IWF (Göttingen)
  • Language: Silent film
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