[Antennas] Picket and Eckel Inc

[Douglas J. Koehler]

Oops, I forgot to mention. there's no radian scale because you don't need one.

To convert polar to rectangular coordinates you use:

y = r sin (angle)
x = r cos (angle)

I know, there's no Cosine scale. Don't need one. Remember that
sin (angle) = cos (90 - angle)

I believe on the model 1000 if you look at the S scale, you'll find 2 
numbers on either side of each major mark. Like this

84|6      83|7      82|8

The number to the left of the mark is cosine, to the right is sine. Some 
brands of rule put the cosine in a different color..


Going polar back to rectangular:

(angle) = arctan (y/x)
r = y / sin (angle)

For radians, 180 / pi = 1 radian. 180/pi is about 57.3 degrees. On some of 
my rules there's a line marked "R" at 57.3 on the C and D scales. Makes 
conversions easy as, um... pi! (Sorry, couldn't resist) ;-)