â¢ Position the grinder in a way that the guard provides the maximum protection to the operator from sparks and/or flying debris. â¢ Use caution when grinding in corners because a sudden, sharp movement of the grinder may occur when the wheel strikes the secondary surface.
A boater may not approach within 100 yards of a military vessel; it must slow to minimum speed within 500 yards of any naval vessel. 8 people found this useful.
Note that for E=0 (eyes at sea level) the observer is at the horizon, and for someone who is 6 feet tall the horizon is 3 miles away. That same six-footer will continue to see a 40-foot tall boat until its about 11 miles away.