A laboratory manual in physics, to accompany Black and Davis' "Practical physics for secondary schools," (1913)
Black, Newton Henry, 1874- [from old catalog] · New York, The Macmillan company · leaf 85
) isconnected between O and D.Then the resistances R, X, ra, Fig 42 and n are so adjusted that nocurrent flows through the galvanometer, which means thatall of Ix has to go on through CB and all of I2 through DJS,and also that C and D are equipotential points. When thisadjustment has been made, the… … MEASUREMENT OF RESISTANCE 71 Dividing equation (1) by equation (2), we have R_mX~~n From this fundamental equation of the Wheatstone bridge,if we know i?, ra, and n, we can compute X. In the form of this appa- R ratus shown in Fig. 43, theresistance ABB consists of
Physics
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