Powder Chamber Ignition Point

[Parrott-Cannon]

What ignition point in a powder chamber produces the highest velocity?

[Double D]

What ignition point in a powder chamber produces the highest velocity?

Do you mean where in the charge does ignition give the greatest velocity-front, middle, back?  If you have a copy of Mullers Treatise, I believe he discusses that.

[GGaskill]

I remember a statement in some 19th century document available online that testing showed that ignition at the breech end of the charge gave highest velocity.

[Double D]

Maybe it wasn't Muller- 18th century, perhaps it was Gibbons, 19th century.  One of the two and perhaps both did something on this theory.

[Cannon Cocker]

"The colonel tried likewise a cylindric chamber of about four inches long, with four vents, one at the bottom, one at the upper end and two in the middle, all four at an equal distance from each other, so that when one was used, the others were stopped by screws, and he found that the lowest carried the shell farthest. and the ranges of the others diminished in proportion as they were distant from the bottom".  Muller.

And other similar experiments as DD says.

[Parrott-Cannon]

Thank you I found the texts.  Interesting information.