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How should I capitalise Hall effect? I am using this in a brochure and want to get the capitalisation right.

I am certain that Hall is capitalised, as this phenomenon (concerning the behaviour of electrical currents near magnets) was named after its discoverer, Mr. Hall.

But what about effect? Should it too be capitalised?

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  • Generally, follow the policies of the place you are writing. In mathematics, some journals would want Zorn's Lemma, while other would want Zorn's lemma.
    – GEdgar
    Commented Mar 15, 2012 at 15:15

2 Answers 2

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You should properly name it the Hall effect.

For more info read this Wikipedia article to understand how it should be used in sentences. Examples:

At the beginning of a sentence:

The Hall effect was discovered in 1879.

In the middle of a sentence:

One very important feature of the Hall effect is that it differentiates between positive charges moving in one direction and negative charges moving in the opposite.

At the end of a sentence:

The absence of the free transverse boundaries renders the interpretation of the Corbino effect simpler than that of the Hall effect.

Used as an adjective in a sentence:

Hall effect devices produce a very low signal level and thus require amplification.

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    Thanks for your really fast response. I had seen that article but I've seen plenty of bad English elsewhere in Wikipedia, so wanted confirmation that this particular article is following accepted grammar rules. Commented Mar 15, 2012 at 12:21
  • I don't see anything wrong with the examples I took from the articles. You can safely follow them.
    – Frantisek
    Commented Mar 15, 2012 at 12:37
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I do see just one error. If indeed the second word in "Hall effect" is not (necessarily) capitalized, then this implies that "Hall effect" is not a proper noun, and hyphenation rules for compound modifiers will apply. Thus, the last example should read "Hall-effect devices produce ..."

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