During the summer of 1959 a series of high resolution acoustic refraction profiles were obtained for the Hartlen Point region of the Scotian Shelf. The profiles were taken across pairs of the three bottomed barium titanate hydrophones, connected by cables to a laboratory on the shore. The fixed positions of these hydrophones enabled the bottom properties to be measured considerably more accurately than is normally possible in water-covered areas. Marked anisotropic effects in the rock bottom were found by the surveys.

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