Clockwise from left: Lindbergh’s sun lines of position, plotted from Washington, D.C., to New York to Michigan; Weems’ personal log; the bubble sextant used in Lindbergh’s training ...

A bubble sextant that Lindbergh used to navigate on his record-setting 1930 flight from California to New York went to an anonymous bidder for $26,400.

In my flight bag is a World War II-vintage Pioneer-Bendix bubble sextant, which I use—just for fun—to see how close those earlier navigators could come to the position fixes now provided by ...

For generations, ever since long-range flight became possible, manual tools were used for these calculations, along with a special bubble sextant to obtain the location of an aircraft. On the surface ...

The fact is often overlooked that as the sextant is a double-reflecting instrument ... of heavenly bodies be made on the exact center of a bubble or other indicator of the horizontal is a feat ...

A description is included of the Mark IXA bubble sextant, with which the navigator continues his observation for two minutes, during which period the altitude is recorded sixty times and the ...

being of the same order of accuracy as readings made with a bubble-sextant. The instrument designed for marine purposes is larger and more accurate; in this type the graduated circles read to one ...