The theodolite supplanted it as a more accurate measurer of angles. He was appointed measurer in the Boston customhouse in 1838 and served until 1846. All AIMS races must be measured by an accredited AIMS/IAAF course measurer. Fay ceremoniously lay down in front of the measurer before the samples were taken. The measurer walks the perimeter of the crown following the drip line fairly closely. Rogers shows how a foot measurer works. The resulting scan is independent of the measurer, making it easier to standardize. This provides the measurer with a satisfaction "gap" which is objective and quantitative in nature.