. The top of the continent; the story of a cheerful journey through our national parks. against the sides of the church andabove it. When you are looking upward at an angleof forty-five degrees you will be looking at the spot inthe sky where the top of the tree would be if it weregrowing in front of the church. * Gee ! said Jack. What fun ! But how will youknow when you are looking up at an angle of forty-five degrees? **That is quite easy, said Doctor McKinley. *Geta large piece of stiff cardboard, and cut it exactlysquare. Then draw a line from its opposite corners andcut the card along this
. The top of the continent; the story of a cheerful journey through our national parks. against the sides of the church andabove it. When you are looking upward at an angleof forty-five degrees you will be looking at the spot inthe sky where the top of the tree would be if it weregrowing in front of the church. * Gee ! said Jack. What fun ! But how will youknow when you are looking up at an angle of forty-five degrees? **That is quite easy, said Doctor McKinley. *Geta large piece of stiff cardboard, and cut it exactlysquare. Then draw a line from its opposite corners andcut the card along this line. That will give you tworight-angled triangles. Hold one of these in front ofyour face so that the shorter base will exactly parallelthe ground; tack it to a tree or pole so that you maybe sure about it. Then with your eye at the lowercomer, glance uj:) the slanting side, and you will have A LONG LIFE AND A HAPPY ONE 199 your angle of forty-five degrees. Where the point inthe sky which you then see intersects the imaginaryline of the trunk rising above the church, you will have. Photograph by Edward S. Curtis A wonderful i)lace to camj) out the height of the General Sherman Tree if it grew infront of your church. Oh, how splendid! said Margaret, jumping upand down in great excitement. Well do it the min-ute we get home. 200 THE TOP OF THE CONTINENT But do you understand just how to do it? askedDoctor McKinley. No, said Margaret, but what do I care? Jackdoes. Dont you. Jack? Jack went over the plan carefully with DoctorMcKinley, and made notes and diagrams. Then henodded confidently to Margaret. All right, kid, he said, Ive got it. Well get thegirls and do it the minute we get home. I know justthe place. This was their first afternoon in the Sequoia NationalPark. They had come in by automobile stage from therailroad-station in the valley, and had settled at thecamp in the Giant Forest. They had found DoctorMcKinley awaiting them. Their first move, naturally,had been to visi
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