Bubble Sextant

A.M. (Air Ministry) Bubble Sextant – Mark IX 6B/151 (Brit Pats 48012 – 490621)

Manufactured by Henry Hughes & Sons (Britain).

The instrument is intended for use on aircraft for the purpose of navigation obtaining the altitude of the sun or other celestial body.

Typical use was RAF WWII nighttime flyers for star fixes to navigate in the RAF such as Anson’s, Lancaster and Wellington Bombers.

The Hughes factory was bombed during the Blitz (between Sept 1940 and May 1941).

Fortunately the Ministry of Supply for Britain had already diversified production with two other firms experienced in the production of delicate equipment. Samuel Smith and Son. Later Smiths Industries for some time, H. Hughes and Son’s parent company, and Verner.

Bubble Sextant

Bubble Sextant Metal Case

Important: Change of Hours & New Entry to Museum

(Oct 1st to Apr 30th)

Open Wed to Sat,  9am to 4pm daily
Closed Sun, Mon & Tues

Pre-arranged Group Tours may be available upon request on closed days.


Effective August 1, 2020, the museum no longer has street-front access. Unfortunately, due to the economic impact of Covid-19, the museum has had to move all its activities to our unit at the rear of Hangar 5. The new entrance to the museum will be via the gate at the north side of the building. Signage with contact and entrance instructions is displayed. Please check back here for updates on our progress as we reorganize the museum. As always, contact us with any questions or to schedule a visit or a flight.