| Title | Keropunk Part 5: Mantle Lanterns | |
| Date | Thursday November 09 2023, @02:23AM | |
| Author | janrinok | |
| Topic | ||
| from the dept. | ||
In part 5 of his "Keropunk" series, blogger Russell Graves, covers mantle lanterns.
All of the previous lanterns I've talked about use the flame as a source of light - carbureted in various ways, but "carbon in the flame glowing directly." A mantle is a device that, when heated, glows brightly in the visible regions - it puts out more light than a blackbody radiator at a given temperature, because it uses materials that are low emissivity in the infrared spectrum (heat), and high emissivity in the visible spectrum (light, useful to humans). There are also some benefits from helping contain the flame and the heat within the enclosure, but the end result is rather more light for a given amount of heat than you'd otherwise get.
Earlier parts in his "Keropunk" series:
Be careful of the thorium in some mantles.
I remember similar lanterns from my childhood, including the Tilley Lamp, but how many of our community have ever seen these lanterns anywhere other than on TV or in movies? Does anyone here still use a similar lamp? - JR
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