D. Stadia

1. Field Conditions

Select an open area that allows a flat horizontal sight for up to 150 feet. Shorter distances are better to minimize rod reading errors.

A windless day is preferred.

The telescope of a  transit or theodolite should be locked in a horizontal orientation. Using an inclined LoS can result in unequal half-intervals, Figure D-1.

Use a level rod with with either an attached bubble or separate hand held bubble - be sure the bubble is in adjustment.

Though not required, a rod bipod provides a steady rod setup.

(a) Inclined: t>b	(b) Depressed: t<b
Figure D-1 LoS Not Horizontal