April 5, 2024
AIRCRAFT BUBBLE SEXTANT 1941 USN WW2 MARK IV U.S. NAVY
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You are bidding on a bubble sextant as follows: "AIRCRAFT OCTANT / MARK IV / BUR. OF AERO. U.S. NAVY / SER. NO. 1173-41 / ORDER NO. 83600 / F.S.S.C. NO. 88-0-250 / MFRD. UNDER PATENTS NOS / 150 1970543 / 2221152 / OTHER PATENTS PENDING / PIONEER INSTRUMENT / DIVISION OF BENDIX AVIATION CORPORATION / BENDIX, NEW JERSEY, U.S.A.". A plaque stating that is on the case and body of the instrument. It is in its original box with ALL ITS COMPONENT PARTS PLUS MANY EXTRA BITS AND THE INSTRUCTIONS FOR ITS MAINTENANCE AND USE. An instruction manual is on E Bay. It needs some cleaning up and a new rubber eye piece, which are available. A connection to a time when our war time aviators didn't look at an instrument that gave their location but had to shoot stars while flying to get a fairly close fix on w they were. I wonder what Uncle Sam paid for this instrument 66 years ago? The Mark IV bubble sextant has a mechanism designed by Lt. Comdr. Ira Hobbs of the Naval Aircraft Factory that averaged observations along with the times at which they were made. It also has a novel method of illuminating the bubble designed by Gregory Rylsky, an engineer employed by Pioneer. The form was introduced in 1941 and remained in use throughout the war.The box weighs 13.5 pounds and measures 11 1/8" by 11 3/4" and is 7 5/8 deep.
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