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Notes for Science Looks at Archery
1. Published as a monograph Bulletin No. 1 of the Archery Review, July l935. and Copyrighted 1935 by the Archery Review Publishing Co.
2. More accurately, from the neutral layer.
3. The stress is also inversely proportional to the radius of curvature of the bent limb.
4. It is a matter of experience, on the other hand, that, when bracing a new bow with a string that gives low bracing height, the latter is more likely to break than is a string that is shortened to give normal bracing height.
5. When a limb is bent, there is maximum tension at the outer convex surface of the back, and maximum compression at the inner concave surface of the belly. At any cross-section, the tension diminishes at we pass from back towards belly; becomes zero at a certain point, then changes to compression. The line passing through all the points so defined is called the neutral axis. The neutral axis has the property of passing through the center of gravity of the section. The geometric surface described by all the neutral axes along the bow may be termed the "neutral layer."
6. This assumption may not be correct. There have been no measurements, to my knowledge, to determine relative efficiencies of bows with rigid mid-section, and those that bend in the handle.
7. Since, as shown by tests, the writer's bows have high efficiency values, ranging from 70 to 85 percent, very slight increase in efficiency is at best possible Some energy loss in the limbs and string is inevitable. If this is 10%—probably a conservative estimate—it leaves a very narrow margin within which to effect improvement.
8. Another way of accomplishing the same thing is to reduce the belly on the side away from the arrow plate, or the back on the same side as the arrow plate.
9. While the manuscript for this article was awaiting publication, the writer, with suggestions from Walther Buchen, devised a round which he has designated the "Art Young Round". in memory of Arthur H. Young, who died on February 26,1935. The feature of the Art Young Round is that no two shots are at the same distance, a fact which makes point-of-aim markers impossible and sights practically useless. It consists of 36 arrows, each hit counting 1. There are six marks, which may be small straw bosses, like those used in archery golf, placed more or less at random in a field. likewise there are six shooting stations. The shortest distance between any station and mark as 30 yards; the greatest, 80. From each of these the archer shoots six arrows successively, one each at the six marks. The round puts a premium on skill in field archery, at which Art Young excelled.