Description
TWO W. & L.E. GURLEY SURVEYOR'S HIGH POST ALIDADES OR STADIAS, TROY, NEW YORK, Polished brass instrument with a 12-in. scope and marked in part on stationary arm "Beaman Stadia Arc No. 3291 Patent Mar 27, 1906," the other with a 13-in. scope, and trough compass, marked 19594.