Lesson plan
Photogram
A photogram is a photographic image made without a camera by placing objects directly onto the surface of a light-sensitive material such as photographic paper and then exposing it to light. The usual result is a negative shadow image that shows variations in tone that depends upon the transparency of the objects used. Areas of the paper that have received no light appear white; those exposed for a shorter time or through transparent or semi-transparent objects appear grey, while fully-exposed areas are black in the final print. The technique is sometimes called cameraless photography. It was used by Man Ray in his rayographs. Other artists who have experimented with the technique include László Moholy-Nagy, Christian Schad (who called them "Schadographs"), Imogen Cunningham and Pablo Picasso. Variations of the technique have also been used for scientific purposes, in shadowgraph studies of flow in transparent media and in high-speed Schlieren photography, and in the medical X-ray. The term photogram comes from the combining form ( ) of Ancient Greek ( , "light"), and Ancient Greek suffix ( ), from (γράμμα, "written character, letter, that which is drawn"), from ( , "to scratch, to scrape, to graze").
Article summary
A photogram is a photographic image made without a camera by placing objects directly onto the surface of a light-sensitive material such as photographic paper and then exposing it to light. The usual result is a negative shadow image that shows variations in tone that depends upon the transparency of the objects used. Areas of the paper that have received no light appear white; those exposed for a shorter time or through transparent or semi-transparent objects appear grey, while fully-exposed areas are black in the final print. The technique is sometimes called cameraless photography. It was used by Man Ray in his rayographs. Other artists who have experimented with the technique include László Moholy-Nagy, Christian Schad (who called them "Schadographs"), Imogen Cunningham and Pablo Picasso. Variations of the technique have also been used for scientific purposes, in shadowgraph studies of flow in transparent media and in high-speed Schlieren photography, and in the medical X-ray. The term photogram comes from the combining form ( ) of Ancient Greek ( , "light"), and Ancient Greek suffix ( ), from (γράμμα, "written character, letter, that which is drawn"), from ( , "to scratch, to scrape, to graze").
Key claims
- publication date: 1920 — source: Wikipedia · confidence 0.95
- publication date: 1922 — source: Wikipedia · confidence 0.95
Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- The record states that the publication date is "1920". What evidence would count against this claim?
- The record states that the publication date is "1922". What evidence would count against this claim?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
Bibliography
- Wikipedia https://en.wikipedia.org/w/index.php?oldid=1378391475
Key claims and bibliography are generated from the same tracked claims and sources as the article page.