33 CFR 84.11 - Shapes.
(2) A cone shall have a base diameter of not less than 0.6 meter and a height equal to its diameter;
(3) A diamond shape shall consist of two cones (as defined in paragraph (a)(2) of this section) having a common base.
Title 33 published on 2013-07-01
no entries appear in the Federal Register after this date.