$$\begin{gathered} {\mathrm{v}}_{\mathrm{A}}={\mathrm{\delta }}_1 \\ {\mathrm{v}}_{\mathrm{B}}={\mathrm{\delta }}_2 \end{gathered}$$

Joint $\mathrm{A}$ on the rigid bar is connected to the lower end of rod $\left(1\right)$ and joint $\mathrm{B}$ is similarly connected to rod $\left(2\right)$. Consequently, the rigid bar deflection at joint $\mathrm{A}$ equals the deformation of rod $\left(1\right)$, and the rigid bar deflection at $\mathrm{B}$ equals the deformation of rod $\left(2\right)$.