Back on Monument Road, the next point to view any activity is on the extended centerline of the longest runway - 13/31.
The surveillance approach course line will coincide with the runway centerline extended.
For a 60 inch oval tub, depending on the model, mount the rod six to eight inches from the centerline of the tub.
An adult louse may be visible as movement on the scalp, especially around the ears, nape of the neck, and centerline of the crown, the warmest parts of the head.
Fold the bottom right edge up so it meets the centerline and the top edge.