Cited passages: PHYWE, P2410200, p. 5, equation (6), and p. 12, Table 1 and end-position discussion; PHYWE, P2410200, pp. 6–8: equipment, Figure 4 wiring, and Procedure (1/6); PHYWE, Wheatstone bridge, P2410200, p. 4, Theory (1/3)–(2/3), equations (1)–(4): divider potentials and balance.