secant clinometer

[Carlos "Guâno" Grohmann]

Olly, thank you for your info. We will keep using the percentage scale.

Carlos



On 5/2/07, Olly Betts <olly at survex.com> wrote:
> On Wed, May 02, 2007 at 06:49:23PM -0300, Carlos Gu?no Grohmann wrote:
> > OK, so I might misunderstood the Suunto site, and our new clino is a
> > different one. The one we have now has a percent scale and a scale
> > ranging from 1-160.
>
> Well, secant(0) is 1, and 160 is the secant of just over 89.6 degrees,
> so that's plausible if 1 is horizontal and 160 is close to vertical.
>
> But the point I was making is that this scale is very non-linear since 2
> is the secant of 60 degrees, so almost all the readings you'll actually
> encounter in a cave survey will be in the range 1-2.  Yet readings over
> 60 degrees get the range 2-160!  You can of course note down more
> decimal places, but 1 degree is 1.00015 so you need to note a lot of
> them.
>
> I assume the scale is available because there's an application where
> you want to calculate something involving secant(inclination), and so
> if you can read that directly off the instrument, you can calculate the
> value by hand much more easily.
>
> Cheers,
>     Olly
>


-- 
+-----------------------------------------------------------+
              Carlos Henrique Grohmann - Guano
  Geologist M.Sc  - Doctorate Student at IGc-USP - Brazil
Linux User #89721  - carlos dot grohmann at gmail dot com
+-----------------------------------------------------------+
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