Mk I instrument case size

Appendix “A” and Drawings

G-ASEA

I checked my “Parts Manual” and found a page very similar to yours. But…it used photographs instead of drawings, and had some of the items of your page but also had items not on your page. There is the possibility of your pictures being from the “Price list of Parts”. Not having seen one, I can only speculate.

I have gone thru all my manuals, and do not have an Appendix “A”. The info on the length of the instrument is helpful. My parts manual does not list any instruments.

Thanks for the info on the oil temp gage.

Cheers.
Ed

Regarding the Oil Temp gauge,the MK1H will be the one you want
as it has 0-140 temp range.
Mike

Appendix “A”

Dear AirMinistry,

Every time I think I have found all the manuals available a new book shows up. That cover does not resemble anything I have, and I thought I had app. “A”.

The oil temp gage is a problem. First part is that I have to use a P&W Wasp 1340 ‘snap cap’ instead of the Jupiter. To cover the Wasp range I should be using 0 to 120^C. Secondly: The Mk IA instrument is mounted to the panel from the front, thus necessitating complete removal of the capillary line each time you wish to remove the instrument panel. Messy and not good for the copper tubing. Third: I have to make a special adapter to fit the bulb to the Wasp. Forth: If I find one, and have it rebuilt, it has to have the freon taken out and disposed of on the moon. Read-megga bucks. And that is if I can convince the rebuilder that he will not glow in the dark because he ‘looked’ at the instrument. I believe the face has to disposed of on Mars.
Because of the unfortunate problem of having to use the Wasp, I have figured that using an ele. instrument with the correct looking face and correct looking case, only the readers of the thread will know. (That means none of you guys are allowed to come near my aeroplane.)
Thank you very much for the information about the “A” manual, I shall see what I can do to procure said object. (how much to copy??)
Thanks again.
Ed

Bulldog parts

Dear G-ASEA

Eureka!!!!!!!! Yes, yes, yes. That plate does not look like any of the information I have. The “Oil and Fuel” selector plate is a dead give away. Now…..it is possible that these parts are used on other Bristol aeroplanes of that era. That I can not tell you without more information.
I would be interested in seeing the other plates. I wish I had seen that selector plate about 6 months ago. my address is ersf2b at oregoncoast dot com.
I write it this way to confuse any spam spyware. But I am finding out that everything is smarter then me, so….
Thanks for the help.

Ed

You could do with finding an Oil Temp Thermometer Mk IA with Stores Ref. 6A/1306. This is the fluorescent equivalent of the 6A/155 luminous guage with 10′ capillary tube which is the one specified in the Bulldog Appendix A Schedule.

Certainly not “unobtanium” I would have thought?

Are these Bulldog parts? I bought this book of 79 plates showing Birstol aircraft parts. No writing other than fuselage or wing, cowling, seating and part numbers. It has two seats drawn so is it a trainer.

Instrument case

Mike,

Thank you for the reply. You hit The nail on the head!!!! The standard bakelite case is the info I need.
It will be for the 2 1/4″ range (not sure, so 2 1/8 might be correct?) And it will have approx. 3/4″ of the instrument sticking out beyond and in front of the mounting ears.
These should be no problem to machine, especially with correct dimensions.
Having a correct or close looking face made up has also become an easy task.
So the question is…..can you supply any dimension?

Cheers,
Ed

Hi BB,this is a confusing problem I MAY be able to help you with,
Oil Temp gauges in the late 1930s and early ww2 are shown as
MK 1A or 1H(I have never seen one),that is to say the they are
the direct reading type..all others appear to be electric.ie MK 1B.
I do not have any information regarding the WW1 types Mk v etc.
Oil Pressure gauges ..WW1 I have seen a metal case MkVB 0-60LBS,
Pre and early WW2 the circular style are in the MK IX range.
Examples are 6A/309, 310, 311, 313, 315, 317, 385. This range is
due to the various lenghts of the capillary.(This also applies to OIL TEMP).
The Bakalite cases I have seen are all of the standard size.
I too am having problems finding a circular oil pressure gauge for
my Hawker Demon panel.
Regards Mike

Mk I oil gauge

I shall take a look at the RAF museum site and see if I can find a Mk V case.

The instruments will go in the Bulldog I am replicating, It is just becoming sooooo difficult to find needed instruments. Either they have been destroyed due to making one glow in the dark (although I have found they are wonderful for lighting the hallways while I run down the hallway with sharp scissors.).

Or the cockpit groups have grabbed what they can, or museums have grabbed the rest. The Jackson group has created some fantastic instruments that are unfortunately not for sale. Oh well. Thus mere mortals have to resort to best case senerio with ‘as close as I can get’. Thus the effort to incase the instrument in an accurate setting with proper dial.

Thank you for taking the time to answer and look thru your collection.

Cheers

I have had a look at my collection of specifications and can only find the MkV gauge. This dates back to Sep 1916.

So what is a MK I gauge fitted to?