National Geographic : 1964 Jul
EKTACHROMESAND KODACHROME(OPPOSITE) BY GEORGEF. MOBLEY© N.G.S. Measurement of colossi calls for a team BESIDE the chill current of Redwood Creek, pipe-smoking Dr. Zahl and Paul Fritz (right) of the National Park Service pull a rubber raft across the stream. Rodman William L. Hebard (left) uses a two-way radio to discuss the proper placement of his surveyor's rod. Holding steel tape taut, Jarrold B. Cone establishes his base line from a tree to a sighting point. By establishing a triangle, lI the men determine the big tree's height. Cone's red ribbon will mark a surveyor's stake. Leaning Tower of Pisa would rise just above the mid-point of the sixth tallest tree, a 352.3-foot pillar seen in the center of the page opposite.