A horizontal collimation test is performed on an automatic level. With the instrument setup at point $1,$ the rod reading at A was $5\mathrm{.}251ft,$ and to $B$ it was $5\mathrm{.}633ft.$ After moving and leveling the instrument at point $2,$ the rod reading to A was $4\mathrm{.}950ft$ and to $B$ was $5\mathrm{.}176ft.$ The distance between the points in the test was $100ft$