on 2003-07-16 09.01, Terry Simpson at [EMAIL PROTECTED] wrote: > James Wentworth wrote: >> Even US road signs use grads (Ex. "7% Grade" > > No. A grad is not a grade. A grade is the rise in height divided by the road > distance travelled expressed as a percentage. A 100% grade = 45 degrees. > Dear Terry,
True, 'A grad is not a grade' except when a grad is a grade is a gon. Currently we use, at least, these ways for measuring angles, all of which might, with suitable qualifications, be called metric (or even SI): angular per cent degrees, decimal degrees, minutes of degree, seconds of degree descriptors such as right angles, straight angles, and revolutions glide ratios such as metres per kilometre grade of a road grads, grades, or gons mils of angle nautical measures from an octant, a quadrant, or a sextant pitch of a roof points of a compass radians revolutions seconds of Right Ascension or hours of RA slope ratios such as metres per kilometre My thought is proposing the use of a quad is to replace all of these with one SI unit. Cheers, Pat Naughtin LCAMS Geelong, Australia --
