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I am from Europe and I do some research for my thesis. I found this picture, which is very usefull for me, but unfortunately the lengths are in imperial units (for lenght they are using something like this 7'-11.5''). I know, that this symbol: ' is for feet and this: '' is for inches. But I am little bit struggling with this notation. Is this interval (it doesn't make much sense if so) or it's x feets minus y inches?

Thanks for the answers, I know that this is lame question, but as European metric system user I am little bit confused :)

enter image description here

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    $\begingroup$ I read 7'-2.5" as seven feet and two-and-a-half inches. $\endgroup$ – Kyle Kanos Apr 11 '16 at 20:51
  • $\begingroup$ The "-" stands for "and". $\endgroup$ – Andrea Apr 11 '16 at 22:47
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Just ignore the dashes. They should just be written as 7'11.5", etc., as seen in this standard reference. But some times people like to put dashes just because they think it looks ugly without them. Here's one example of someone explicitly saying he wants to do it the way seen here, mentioning that it's what "you would see on a set of plans here in America". (As an American, I would say that I see it without a dash more often, but I have seen it both ways. And I agree that with the dash is confusing -- and distracting.)

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  • $\begingroup$ (+1) actually, they should be written as $2.43\ \mathrm m$ ;-) $\endgroup$ – AccidentalFourierTransform Apr 11 '16 at 21:23
  • $\begingroup$ And, of course, there are 2.54 cm/inch, and 12 inches/foot. Also, 1 m is equal to 39.37 inches. Hopefully, all of the comments answered the question adequately. $\endgroup$ – David White Apr 12 '16 at 0:44

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