Lesson plan
Tinplate
tin in a tin factory in South Wales during World War I Tinplate consists of sheets of steel coated with a thin layer of tin to impede rusting. Before the advent of cheap mild steel, the backing metal (known as " ") was wrought iron. While once more widely used, the primary use of tinplate now is the manufacture of tin cans. In the tinning process, tinplate is made by rolling the steel (or formerly iron) in a rolling mill, removing any mill scale by pickling it in acid and then coating it with a thin layer of tin. Plates were once produced individually (or in small groups) in what became known as a pack mill. In the late 1920s pack mills began to be replaced by strip mills which produced larger quantities more economically. Formerly, tinplate was used for tin ceiling, and holloware (cheap pots and pans), also known as tinware. The people who made tinware (metal spinning) were tinplate workers. For many purposes, tinplate has been replaced by galvanised metal, the base being treated with a zinc coating. It is suitable in many applications where tinplate was formerly used, although not for cooking vessels, or in other high temperature situations when heated, fumes from zinc oxide are given off; exposure to such gases can produce toxicity syndromes such as metal fume fever.…
Article summary
tin in a tin factory in South Wales during World War I Tinplate consists of sheets of steel coated with a thin layer of tin to impede rusting. Before the advent of cheap mild steel, the backing metal (known as " ") was wrought iron. While once more widely used, the primary use of tinplate now is the manufacture of tin cans. In the tinning process, tinplate is made by rolling the steel (or formerly iron) in a rolling mill, removing any mill scale by pickling it in acid and then coating it with a thin layer of tin. Plates were once produced individually (or in small groups) in what became known as a pack mill. In the late 1920s pack mills began to be replaced by strip mills which produced larger quantities more economically. Formerly, tinplate was used for tin ceiling, and holloware (cheap pots and pans), also known as tinware. The people who made tinware (metal spinning) were tinplate workers. For many purposes, tinplate has been replaced by galvanised metal, the base being treated with a zinc coating. It is suitable in many applications where tinplate was formerly used, although not for cooking vessels, or in other high temperature situations when heated, fumes from zinc oxide are given off; exposure to such gases can produce toxicity syndromes such as metal fume fever.…
Key claims
- date of foundation: 1750 — 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 date of foundation is "1750". 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=1306753896
Key claims and bibliography are generated from the same tracked claims and sources as the article page.