A differential leveling loop began and closed on BM Bridge (elevation 103.895 m). The plus sight and minus sight distances were kept approximately equal. Readings (in meters) listed in the order taken are 1.023 (+S) on BM Bridge, 1.208 (-S) and 0.843 (+S) on TP1, 0.685 (-S) and 0.982 (+S) on BM X, 0.944 (-S) and 1.864 (+S) on TP2, and 1.879 (-S) on BM Bridge. Prepare, check, and adjust the notes.