Right...  Thanks, Howard.

Now, what's intriguing is that instead of measuring the actual angle what one is 
really measuring is its tangent!  (From a values point-of-view this methodology may 
only make sense till 50 gr, since after that one would start seeing slopes in excess 
of 100%, all the way to infinity!!!...)

I.e. technically one is moving from measuring the angles themselves to a property 
thereof.  The only benefit I see of this procedure is the accommodation of both ifp 
and SI when it comes to measuring the sides of the right triangles.  With this 
procedure one can comfortably measure the "angle" in either in-ft or m.  Quite clever 
actually.

Nonetheless, IMHO this "new" technique should NOT be encouraged.  Either we say we're 
measuring the angle or call it something else (and maybe people have already by 
calling it "slope", I don't know).

Comments?...

Marcus

On Fri, 07 Feb 2003 10:22:18  
 Howard Ressel wrote:
>Yes that would be 5%, vertical rise over horizontal distance 50 mm/1000mm x100=5%.
>
>Pavement cross slopes are measured in % (usually 2% for normal crown) and highway 
>grades are in %. That's one benefit of our conversion, cross slopes are no longer in 
>fractions of an inch per foot (1/4"/foot) but in easy to understand percentages. 
>
>Howard Ressel, Metric Manager
>NYSDOT Region 4
>
>>> "Ma Be" <[EMAIL PROTECTED]> 02/07/03 10:13AM >>>
>Can someone here explain to us what % gradient angle means please?  I'm uncertain 
>about this myself.  Does it refer to % of the right angle or the horizontal distance? 
> For instance, say an angle in the first quadrant has the horizontal distance of 1 
>meter and the height was say 5 cm, would this carachterize a 5% gradient angle?
>
>Thank you (anyone) in advance for this clarification.
>
>Marcus
>
>On Thu, 6 Feb 2003 13:53:49   
> Joseph B. Reid wrote:
>>John Nichols in USMA 24763 has introduced a third quantity into this 
>>discussion: viz. slope or gradient.   I would expect a 3% gradient 
>>would be 0.03000 radians, not .0000456...
>
>
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>
>Howard Ressel
>Project Design Engineer, Region 4
>(585) 272-3372
>
>


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