A list that I have quotes this tyre size for wheels AH8310 (Sturgeon), AH8800, AH8868, AH8883, AH8891, AH9349, and AH9729 (Gannet). Don’t know about tread patterns though.
I think you’ll find that it is the mounting base for a 16mm cine projector. LF & HF controls being in effect the tone controls for the sound. It was called a Debris, a french name, though I’m not sure of the spelling. The curvature allowed for the optics to be tilted to suit the screen position. It was itself mounted on three heavy cast iron legs. Certainly still in use at Waddington in 1980 and probably long after that.
As for 2BA or 4BA then it all depends upon the instrument. Most British instruments had captive nuts and of course you should use the appropriate size. I would use slotted round head screws unless, on an original panel, there is an obvious countersinking, or it is defined in the spare parts manual. Generally nickel or cadmium plated steel screws would be used. Except near a magnetic compass where brass screws are essential.
As for 2BA or 4BA then it all depends upon the instrument. Most British instruments had captive nuts and of course you should use the appropriate size. I would use slotted round head screws unless, on an original panel, there is an obvious countersinking, or it is defined in the spare parts manual. Generally nickel or cadmium plated steel screws would be used. Except near a magnetic compass where brass screws are essential.
Just in case anyone is interested, I’ve now discovered that the Mk 21A Graviner automatic extinguisher would have come from a de Havilland Vampire.
I don’t have spare parts schedules for single seat Vampires but the Vampire T11 appears to have had the Mk20A (see circuit below) and also the single seat Venoms did:
Just in case anyone is interested, I’ve now discovered that the Mk 21A Graviner automatic extinguisher would have come from a de Havilland Vampire.
I don’t have spare parts schedules for single seat Vampires but the Vampire T11 appears to have had the Mk20A (see circuit below) and also the single seat Venoms did:
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