Octagon

Section 28.7). One more advantage of a tubular section is that it exerts equal forces at all points of the eticlosure and relieves it and the conductor from any undue stresses. Octagonal and hexagonal sections are also used as they also have near-symmetry. 

Windbreaker - A windbreaker is necessary to prevent the wind from extinguishing the flames. It serves also to hide the flames. Since a solid wall produces undesirable eddies, a louvered type is used. The windbreaker is octagonal and is placed 2.4 m from the stack. The height should be at least 0.6 m more than the stack clearance. The slats should be at least 225 mm wide and overlap by at least 50 mm. They should slope 45° to direct the flow of air downward on the inside of the enclosure. Four access doors are provided in the windbreaker, equally spaced around the periphery. 

Achtflachner, m. octahedron, acht-gliedrig, a. eight-membered. -kantig, a. octagonal, -los, a. inattentive, negligent, -mal, adv. eight times. 

A variation of dipping suitable for small items is barrel painting or tumbling . A cylindrical or octagonal barrel is loaded with the articles to be painted plus a small amount of paint. The barrel is rotated until the items are completely coated, when they are removed for drainage and drying. 

Jones, Rufus Matthew. Mysticism and democracy in the English Commonwealth. 1932 reprint, Octagon Books, 1965. 184 p. 

Percival, Milton Oswin. William Blake s circle of destiny. New York Columbia Univ P, 1934 reprint, New York Octagon Books, 1964. viii, 334 p. ISBN 0-374-96384-3... 

Merton, Egon Stephen. Science and imagination in Sir Thomas Browne. New York King s Crown P., 1949 reprint, New York Octagon Books, 1969. viii, 156 p. 

---