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On Fri, 23 Oct 2009 01:36:14 -0600,  wrote:

>
> To complete the picture, British artillery developed the "grad," or 400
> divisions in a circle.  If you have a trig calculator then you can
> probably do trigonometry in grads, degrees or radians.

I could be stretching my memory too far, but the grad or gon strikes me as
being French.  Sort of the way they went about defining the meter as being
a multiple of ten (10,000,000) from the pole to the equator through Paris.

As far as I can determine, the UK has used the US 6400 divisions of the
mil scale since before WWI for artillery, and in military panoramic
sketching between a reference point and other significant features.

I don't have any idea when the East Bloc started using 6000 divisions of
the circle for their "mil" scale, but the mortars are marked that way, and
so are the binoculars.

--
Richard . . .

Using Opera 9.2.4 after the "Dog" died

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