[Illustration: FIG. 70--A hook, or recurved spit, south of Brigantine Inlet, New Jersey, as photographed from a height of 10,000 feet, showing the strong curving upstream characteristic of spits on this ocean-facing coast. The growing end of the spit, resembling a lily bud, shows an underwater extension beyond the light-colored beach sand. To be noted is the filling in of the lagoon behind the reef and its pools and drainage lines. This figure is practically a southern continuation of Fig. 68. Scale, about 1:9.000.] EXPERIMENTS BY THE UNITED STATES, FRENCH, AND OTHER COAST SURVEYS The use of photographs in charting the coast line was tested by the United States Coast and Geodetic Survey.[11] A flight was [Illustration: FIG. 71--A hook, or recurved spit, showing interference with natural growth: The northern end of Ocean City. N. J., as photographed from a height of 10,000 feet. At the right (east) appears the curved body of sand, light-colored where dried, darker-colored where bathed by the waves and fringed by surf. To the left certain “improvements” seem to have interfered with the natural growth of the spit, and a small bay of shallow water has been enclosed by the formation of a bay-mouth bar across the outlet to the north. Scale, about 1:14,000.] made over the coast of New Jersey by Captain A. W. Stevens of the United States Army Air Service, March 20, 1920, in a plane equipped with a K-1 camera of 10-inch focal length, which makes negatives 18 by 24 centimeters in size. During the flight the camera was maintained at an altitude of about 10,000 feet. The course was covered by 183 exposures made at such intervals of time that the prints overlap. Unfortunately the exposures were not sufficient to give all the details desired for marsh and water areas, but prints were made on developing paper suitable for showing extreme contrast. These were matched together and a continuous picture obtained. A part [Illustration: FIG. 72--New Point Comfort, a complex recurved spit at the tip of the peninsula enclosed by the York and Rappahannock Rivers, Virginia. A vertical view taken from an altitude of about 10,000 feet, showing in order from right to left (east to west): the wavy surface of Chesapeake Bay; a light-colored band of beach sand curving westward in a compound hook made dark-colored in some places by trees and brush; a shallow bay west of the beach in which may be seen shoals, channels, and sand bars under water; and low-lying areas showing woodland and cultivated fields. The photograph was taken at a time of day when reflected light from the partly enclosed body of water was dispersed, allowing the submerged forms to appear. Scale, about 1:12,000.]