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View Full Version : Ever needed grad (gon) in real life?



kucharek
2006-Oct-14, 08:23 AM
I recently found some TI-59 calculator in the garbage. Nice toy, my first "new" pocket calculator in 20 years.. Was my dream when I was a kid, but way beyond my financial possibilities then... :-)
As usual, it can do trigonometric calculations in deg, rad and grad (gon).
Made me thinking that in all the years, I never came across gon in real life. Maybe I've the wrong interests or profession.
Did ever one of you really needed/used gon in real life? Why?

Harald

01101001
2006-Oct-14, 10:21 AM
Wikipedia: Theodolite (http://en.wikipedia.org/wiki/Theodolite)

Both axes of a theodolite are equipped with graduated circles that can be read out through magnifying lenses. The vertical circle (the one associated with the horizontal axis!) should read 90° or 100 grad when the sight axis is horizontal (or 270°, 300 grad, when the instrument is in its second position, "turned over"). If not, we call half of the difference with 300 grad index error.

Wikipedia: Grad (angle) (http://en.wikipedia.org/wiki/Grad_(angle))

Although attempts at a general introduction were made, the unit was really only adopted in some countries and for specialized areas, like land measurement. The French artillery has used the grad for decades.

mugaliens
2006-Oct-16, 05:00 PM
My favorite was my HP-15C, which cost just under $100 in 1985.

These days, you can't buy one on eBay for less than... well, I guess the prices have dropped since I checked about three years ago. Used ones are running around $60.

But one that's new, in the box, in shrink wrap, has crossed the $1,000 mark with a little more than 6 hours to go!

I'd like to find the jerk who stole it in the middle of a test back in 1986 and...