A-A-52024 Compass, Magnetic: Surveyor's And Transit, Pocket; With Optional Ball And Socket Joint Or Ball And Socket Head, And Jacob's StaffThis description covers two types of magnetic compasses, and includes the optional ball and socket joint, or ball and socket head, and Jacob's staff. Type I compasses are intend for use in topographical surveying field work done by the U.S. Forest Service. Type II compasses are used in geology and survey reconnaissance.

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