. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 'g-2-. deviation from the plane is subsequently referred to as the "twist," and the peculiarity that, as seen in the cross section of tig. 2, one face is more rounded than the other, is called the "; Boomerangs of the sec- ond type (tig. 3) are about TO cm. long and 7 cm. wide, and have a cross section similar to that of fig. 2. The "'twist''1 is in the op- posite direction, involving a left-handed rotation
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 'g-2-. deviation from the plane is subsequently referred to as the "twist," and the peculiarity that, as seen in the cross section of tig. 2, one face is more rounded than the other, is called the "; Boomerangs of the sec- ond type (tig. 3) are about TO cm. long and 7 cm. wide, and have a cross section similar to that of fig. 2. The "'twist''1 is in the op- posite direction, involving a left-handed rotation of about 3°. The axes of rotation are now D E, F E instead of E D, E E. RETURNING FLIGHTS. An implement of the first type is held with the more rounded side to the left and the concave edge forward. It is thrown, with plane vertical, in a horizontal direction, and as much rotation as possible is given to it. The plane of rotation does not remain parallel to its original direction, but has an angular velocity (1) about the direc- tion of translation, and (li) about a line in its plane perpendicular to this. The effect of (2) is that the path curls to the left, while owing to (1) the plane of rotation inclines over to the right (i. e., rotates in the direction of the hands of a clock facing the thrower), and its inclination to the vertical becomes comparable with 30° in two seconds. The angular velocity (2) will now imply that the path bends upward as well as horizontally round to the left. When the boomerang has described a nearty complete circle its pace has diminished, and it falls to the ground near the thrower. (See figs. 4, 5, in which projections on a horizontal and on a vertical plane are. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States Nation
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