Comparison of Weights
TABLE
| 1 pound avoirdupois | = | 7000 | grains |
| 1 ounce avoirdupois | = | 4371⁄2 | grains |
| 1 pound Troy, or apothecary | = | 5760 | grains |
| 1 ounce Troy, or apothecary | = | 480 | grains |
CIRCULAR MEASURES
Circular or Angular Measures are used in surveying, navigation, astronomy, geography, reckoning latitude and longitude, and computing differences in time.
A Circle is a plane figure bounded by a curved line, every point of which is equally distant from a point within, called the center.
The Circumference is the bounding line of a circle.
The Radius of a circle is a straight line drawn from the circumference to the center.
The Diameter is a straight line drawn through the center, with the ends terminating in the circumference.