ball recording sextant and case

INSTRUMENTS - SEXTANTS
Mergenthaler Linotype Co.
USA, NY, Brooklyn
Circa 1944
Box 10-1/2 x 12-1/8 x 6-1/16 in.

Ball recording sextant, in wood box with bail handles, stamped on brass plate on box & on sextant "BALL RECORDING SEXTANT/ MARK 1 MOD. O/ U.S. NAVY BuSHIPS/ N (circled) 6123 1944/ MERGENTHALER LINOTYPE COMPANY/ BROOKLYN, NEW YORK", inside box lid U.S. Naval Observatory, Washington, D.C. Collimation Certificate dated Feb. 19, 1945; frame alloy(?), scale graduated 0 deg. to 90 deg. by 1 deg., drum micrometer vernier reading to .1', hard rubber handle, molded on back of frame "BRS-52-AA", equipped w/2 telescopes, one marked "DAY" & one marked "NIGHT", each w/built-in screens & rubber eye piece. Ref: "Peabody Museum Collection of Navigating Instruments", by M.V. Brewington, Peabody Museum, Salem, MA, 1963, pg. 5, #4, & plate XIV, M10994. Longest measurement w/o telescope 9"; telescopes (LOA incl. rubber eye pieces) each 10 3/4"

1979.81