The drawings of the Tacony-Palmyra bridge do not explicitly show a section of the the top chord of the truss on which the strain gauges are mounted. The above image may help you understand the locations of the various pieces that are specified in the notation described in the lab problem e.g. "1-Cov. 28x1/2" is the brown top piece is this image. The location of the four strain gauges are shown in red.
Note that what matters for the calculations you're doing is the total area of the steel, not the specific locations.
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