ntific J^mmatu The segmental bearings on which the span revolvesare struck to a, radius of 26 feet and cover a circulararc of 80°. Their faces are provided with segmentalcast-steel tracks with rectangular pockets formed inthem, into which mesh the teeth of a heavy rack whichis carried on the… … Photograph taken by a Smithsonian observer at Wadesboro, N. C.Exposure, 82 seconds. TOTAL SOLAR ECLIPSE OF MAY 28. that the span will open or close by gravity throughthe first 40 of its travel, leaving the operating machin-ery to complete the closure or opening. Thus, if thelocking mechanism is…
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