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

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?


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.

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...