[USMA:27224] Re: Angles - quads and milliquads

[Joseph B. Reid]

In USMA 27219 Marcus and Pat Naughtin discussed at length the quad, 
grad, grade, and gon and their subdivisions.  However, I do not find 
these units in the metric bible. The trouble with these units is that 
they require a repeating decimal fraction to express one third and two 
thirds of a right angle, two very common angles in mechanical 
engineering. Table 6 in the metric bible lists the degree, minute and 
second of angle, but in a footnote adds "ISO 31 recommends that the 
degree be subdivided decimally rather than using the minute and second."