$(2)$ In trigonometric leveling from $A-B.$ The slop distance and zenith Angle measorement at $B$ were $546\mathrm{.}46$ fT and $94{08}^{\text{'}}{86}^{\text{'}}?$ AT A these measorement were $5462\mathrm{.}58$ f$1$ and $85{51}^{\text{'}}{47}^{\text{'}\text{'}}$ If the Intrument and rod herghts werE equal, calculate the ditferent in elevation from $A-B$ based on reci procal leveling Technique and ignore the effeet of Curvature of sinth