# How to read this length interval in imperial units?

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 :)

• I read 7'-2.5" as seven feet and two-and-a-half inches. – Kyle Kanos Apr 11 '16 at 20:51
• The "-" stands for "and". – Andrea Apr 11 '16 at 22:47

• (+1) actually, they should be written as $2.43\ \mathrm m$ ;-) – AccidentalFourierTransform Apr 11 '16 at 21:23