->> taking the numbers from their Example 1 on page 19, i get
->> pretty much the proper answer they get...

->> theirs == p=29.7, T=75, T'=65.5, U=0.603 or 60.3 percent

->>   mine == p=29.7, T=75, T'=65.5, U=0.6025655547 or 60.25655547 percent

->> close enough for me and with rounding, it is 60.3

 DW> Just for fun, I put the same temperatures into the little
 DW> BASIC program I posted here yesterday. I changed the
 DW> barometric pressure to 100.6 kilopascals, which is close
 DW> to 29.7 inches of mercury. The program calculated the
 DW> relative humidity to be 60.35 percent. So that's very
 DW> close to the two answers found by other formulae.

i looked at the code you posted and it appears to be basically the same...

 DW> I guess the question is, how accurate does Herman need the
 DW> calculation to be? And how will he know if it's right?

yes, that is the question ;)

)\/(ark