Swedish cannon of Tornqvist`s sistem

[greenstone]

My regards!

Question to colleagues.

There is on the drawing an element of the Swedish cannon of 1780-1790 

The naval cannon of Tornqvist`s sistem

 How it should look: A, B, C or else.

I can not find a  photo of this real cannon in internet.

 

Colleagues, help me please.

 

 

Edited December 11, 2018 by greenstone

[greenstone]

17 minutes ago, Y.T. said:

It is B with pronounced depression on square area. 

 

 

Like this?

[druxey]

It appears to be a receiver for securing a flintlock mechanism on the side of the piece for firing the gun.

[greenstone]

 

Gentlemen,

can show this in the photos of the real guns?

[jud]

The drawing clearly shows a touch hole leading to the chamber in the usual manner. The protected hole on the side of the gun is clearly at the Center-line of the bore but not connected, so it being part of an ignition system is unlikely. Location at the rear and side of the gun, I would be thinking, 'aiming device', location poor for pointing the gun, sights on top are more common but being on the C/L of the bore, a logical place to indicate the elevation angle which is related to range to the target. may have had aiming marks that were used after the vertical angle was set from tables for the range. The device was probably removed for firing and was probably not used on guns that were afloat. Speculation on my part, guided by experience with newer guns, the tools change but the physics remains the same.

Edited December 12, 2018 by jud