Unknown device

[VALENGO]

I need help to identify this device, it seems to be intended for keeping level fly or for steady diving angles, but no idea about age or machine in wich it delivered service.
Any suggestion, thanks (the device is heritage from an old uncle, now passed away).

[timshatz]

Looks like some type of range setter for an artillery piece. That's the best I can think of offhand. But somebody on this board will know more.

Couple of questions:
-Is there any writing on it? If so, what kind?
-Any stamps or manufacturers marks on it?
-Any dates?

[VALENGO]

Yes, I always assumed that it is for a flying machine, but, now that you say it, it could be for artillery. Good approach.
There is no ID stamps (only the serial number that can be seen) no box, no papers.

[Airframes]

Without knowing its size, it's difficult to tell, but it looks like it could be one part of a 'sight' as used on mortars, or on machine guns used in the sustained fire role. This would be aligned with two or more marker posts, and elevation etc set by using the scale calibrated on the quadrant. The principle is not unlike a theodolite or sextant. It is very possible that, as already mentioned, it is off an artillery piece.

[VALENGO]

The chevron is 4 cms long. Is reasonable to think that the device is detachable to avoid damages due to the burst.

[timshatz]

If you have any friends who are civil engineers, they might be able to help you with it. The principles of artillery direction and aspects of civil engineering are very similar.

[Aussie Mossie]

As a retired Artillery Officer and Civil Engineer I can say I have never seen one of these objects.

The scale appears to be too coarse for artillery, you would need to be able to set angles to minutes to be effective.

It could be a means of measuring the angle of a crane Jib.