Editing Talk:2484: H-alpha
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A H(ydrogen)-Alpha filter is a special lens used for viewing the {{w|H-alpha|Hydrogen-Alpha}} wavelength of light through telescopic or photographic devices. It works by filtering out all wavelengths of light except the red spectral line associated with hydrogen. This is commonly used to see shape and structure of objects that emit said light (namely, our own sun, and various nebulae as mentioned in the text). | A H(ydrogen)-Alpha filter is a special lens used for viewing the {{w|H-alpha|Hydrogen-Alpha}} wavelength of light through telescopic or photographic devices. It works by filtering out all wavelengths of light except the red spectral line associated with hydrogen. This is commonly used to see shape and structure of objects that emit said light (namely, our own sun, and various nebulae as mentioned in the text). | ||
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The Hindenberg was supposed to be using Helium, but the USA was the prime producer at that time and for some reason refused to supply Germany at the time. This forced the use of Hydrogen, with the regrettable result. Choice of exterior paint, the gas 'bag' design being too permeable and lack of earthing were also factors. [[User:RIIW - Ponder it|RIIW - Ponder it]] ([[User talk:RIIW - Ponder it|talk]]) 20:27, 3 July 2021 (UTC) | The Hindenberg was supposed to be using Helium, but the USA was the prime producer at that time and for some reason refused to supply Germany at the time. This forced the use of Hydrogen, with the regrettable result. Choice of exterior paint, the gas 'bag' design being too permeable and lack of earthing were also factors. [[User:RIIW - Ponder it|RIIW - Ponder it]] ([[User talk:RIIW - Ponder it|talk]]) 20:27, 3 July 2021 (UTC) | ||
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| − | {{w|MetLife|Metropolitan Life Insurance Company}} (AKA MetLife) is an insurance company that licensed the Peanuts characters, In particular, Snoopy in their advertising. They featured the {{w|Snoopy}} character in his alter-ego role of World War I Fighter Ace (which frequently fought with the Red Baron in the Charles Schulz comics) in both print and television ads between 1985 and 2016, and most notably pictured on some of their advertising blimps. [[Special:Contributions/162.158.142.160|162.158.142.160]] 06:29, 3 July 2021 (UTC) Not the Red Baron | + | {{w|MetLife|Metropolitan Life Insurance Company}} (AKA MetLife) is an insurance company that licensed the Peanuts characters, In particular, Snoopy in their advertising. They featured the {{w|Snoopy}} character in his alter-ego role of World War I Fighter Ace (which frequently fought with the Red Baron in the Charles Schulz comics) in both print and television ads between 1985 and 2016, and most notably pictured on some of their advertising blimps. |
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| + | [[Special:Contributions/162.158.142.160|162.158.142.160]] 06:29, 3 July 2021 (UTC) Not the Red Baron | ||
Many nebulae contain excited hydrogen atoms emitting the H<sub>α</sub> wavelength, so a H<sub>α</sub> filter is useful for removing other light such as light pollution, making nebulae stand out in photographs. | Many nebulae contain excited hydrogen atoms emitting the H<sub>α</sub> wavelength, so a H<sub>α</sub> filter is useful for removing other light such as light pollution, making nebulae stand out in photographs. | ||
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In most cases when a sun filter is mentioned, it's probably a white-light filter that only reduces the light intensity. A H<sub>α</sub> filter is used to highlight the sun's chromosphere – the layer above the sun's apparent "surface", the photosphere. | In most cases when a sun filter is mentioned, it's probably a white-light filter that only reduces the light intensity. A H<sub>α</sub> filter is used to highlight the sun's chromosphere – the layer above the sun's apparent "surface", the photosphere. | ||
| − | I'm not sure whether the same filters are actually used for photographing both the sun and nebulae. [[Special:Contributions/162.158.183.220|162.158.183.220]] 11:52, 3 July 2021 (UTC) | + | I'm not sure whether the same filters are actually used for photographing both the sun and nebulae. |
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| + | [[Special:Contributions/162.158.183.220|162.158.183.220]] 11:52, 3 July 2021 (UTC) | ||
I think someone should edit the summary to detail two points: One, that blimps are not the same as zeppelins. The latter has a rigid body and tanks of gas, rather than the former's balloon body. And two, airships such as the Hindenburg were never designed to be flown using hydrogen; it would have continued to use helium on that one fateful flight if it had not been for a trade embargo on Germany for the gas from its largest supplier, the United States. | I think someone should edit the summary to detail two points: One, that blimps are not the same as zeppelins. The latter has a rigid body and tanks of gas, rather than the former's balloon body. And two, airships such as the Hindenburg were never designed to be flown using hydrogen; it would have continued to use helium on that one fateful flight if it had not been for a trade embargo on Germany for the gas from its largest supplier, the United States. | ||
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I don't believe blimps have really ever been flown with hydrogen, but someone who knows better should add it. | I don't believe blimps have really ever been flown with hydrogen, but someone who knows better should add it. | ||
[[Special:Contributions/172.69.142.62|172.69.142.62]] 20:02, 4 July 2021 (UTC) | [[Special:Contributions/172.69.142.62|172.69.142.62]] 20:02, 4 July 2021 (UTC) | ||
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