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2. Ironwork - Wikipedia

   en.wikipedia.org/wiki/Ironwork

   There are two main types of ironwork: wrought iron and cast iron. While the use of iron dates as far back as 4000 BC, it was the Hittites who first knew how to extract it (see iron ore) and develop weapons. Use of iron was mainly utilitarian until the Middle Ages; it became widely used for decoration in the period between the 16th and 19th century.

3. Cast-iron architecture - Wikipedia

   en.wikipedia.org/wiki/Cast-iron_architecture

   Cast iron was not useful for items in tension like beams, where the more expensive wrought iron was preferred. Improvements in production saw the costs decrease at the same time as cast iron gained popularity. The puddling process, patented in 1784, was a relatively low cost method for producing a structural grade wrought iron.

4. History of street lighting in the United States - Wikipedia

   en.wikipedia.org/wiki/History_of_street_lighting...

   Although the tower lighting in Detroit provided "uniform carpets of light", it was ineffective in providing sufficient lighting for high-traffic areas and routes. After five years, Detroit began to dismantle its towers. [1] As of October 2021, the only lighting towers that remain in the United States are in Austin, Texas.

5. Cap lamp - Wikipedia

   en.wikipedia.org/wiki/Cap_lamp

   The two most recent variants of the cap lamp are the GEN 4 and GEN 5 models. The GEN 4 model, approved for use by the Mine Safety and Health Administration (MHSA), uses the headpiece of existing cap lamps, but retrofitted with new LEDs and electronics. The GEN 5 model is very similar to the GEN 4 model except with a more intense spot beam that ...

6. Mining lamp - Wikipedia

   en.wikipedia.org/wiki/Mining_lamp

   This enabled the light to pass through and reduced the risk of explosion by stopping the "firedamp" methane gas coming in contact with the flame. [1] 1840 Mathieu Mueseler Exhibited The Museler Lamp in Belgium. [2] 1859 William Clark patented the first electrical mining lamp. [3] 1870s J.B.Marsaut (France) double gauze design [4]

7. List of automotive light bulb types - Wikipedia

   en.wikipedia.org/wiki/List_of_automotive_light...

   Cap (Base) Filaments Nominal power Comments Image PC194 T10 (if removable) or fixed to holder 1 14 V / 3.78W Used on circuit boards for e.g. dash lights, gauge cluster backlights. Similar in size to W3W if with a T10 base. PC74 T1-3/4 (if removable) or fixed to holder [9] 1 14 V / 1.4W Used on circuit boards for e.g. dash lights, gauge cluster ...