"The San Francisco-Oakland Bay Bridge triangulation net": presented to Student chapter, Am. soc. c.e. by the author, Donald R. Warren
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15 kilogram weight accumulated error accuracy accurate angle closure angle observations angle was obtained average angle ball bearing base line measurements best results Bureau of Standards calculated length check base line closing the figure computation condition equations correct distance between points divergence elevation Embarcadero end graduations Engineer equal 360 degrees feet Francisco-Oakland Bay Bridge gadgets horizontal limb horizontal projection horizontal refraction I.Cs instruments invar tapes Key Route line was measured magnifying glass marking tables mede Midtown Hudson Tunnel night Oakland side observed angles order triangulation ordinary transit p;ie piers probable value prorating quadrangle San Francisco-Oakland Bay satisfy secondary stations seconds of arc separate angles single angle six observations surface telescope temperature Tension was applied Theodolites theory of least thermo qualities triangulation stations trianguletion trigonometric Vertical hairs Yerba Buena Island