bubble sextant

bubble sextant

[′bəb·əl ′sek·stənt]
(navigation)
A sextant with a bubble or spirit level to indicate the horizontal.
References in periodicals archive ?
Nothing came of the suggestion and it is difficult to judge what level of merit it had as a stopgap fix to counter weaknesses in the design structure--particularly at the panel incorporating the aperture for the bubble sextant where the fingers of disaster first made their fatal intrusion.