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Part A

A horizontal collimation test is performed on an automatic level. With the instrument setup at point $1,$ the rod reading at A was $5\mathrm{.}281ft,$ and to $B$ it was $5\mathrm{.}493ft.$ After moving and leveling the instrument at point $2,$ the rod reading to A was $4\mathrm{.}910ft$ and to $B$ was $5\mathrm{.}156ft.$ The distance between the points in the test was $100ft.$

What is the collimation error of the instrument?

Express your answer to three significant figures and include the appropriate units.

$=$

Part B

What is the corrected reading to A from point $2?$

Express your answer to four significant figures and include the appropriate units.

Correct reading to $A=$