Misidentified gun

[cwebster4]

I purchased this stereoview because I knew it was misidentified and would like to see if I can find out what gun is in this picture.
I know what it is not.
It's not a 200-pounder Parrott as it is misIDENTIFIED as on the reverse.
It's not a Rodman. Not elevation sprockets
It's not a Columbiad
It's not a Blakely.
There has been a suggestion but I wanted to turn to the learned members of this forum for their opinion.

The reverse also indicates the photo was taken at the New York "Brooklyn" Navy Yard.

Would welcome any comments or advice.

 

[UCVRelics]

I purchased this stereoview because I knew it was misidentified and would like to see if I can find out what gun is in this picture.
I know what it is not.
It's not a 200-pounder Parrott as it is misIDENTIFIED as on the reverse.
It's not a Rodman. Not elevation sprockets
It's not a Columbiad
It's not a Blakely.
There has been a suggestion but I wanted to turn to the learned members of this forum for their opinion.

The reverse also indicates the photo was taken at the New York "Brooklyn" Navy Yard.

Would welcome any comments or advice.

View attachment 443948

Looks like a Dahlgren

 

[cannonmn]

15 inch Dahlgren, made for Monitor turrets

 

[rebelatsea]

15" Dahlgren, early pattern, comparing the length with the guys height.

 

[Johnny Shafto]

FROM WIKIPEDIA: Dahlgren's design philosophy evolved from an accidental explosion in 1849 of a 32 lb (14.5 kg) gun being tested for accuracy, killing a gunner. He believed a safer, more powerful naval cannon could be designed using more scientific design criteria. Dahlgren guns were designed with a smooth curved shape, equalizing strain and concentrating more weight of metal in the gun breechwhere the greatest pressure of expanding propellant gases needed to be met to keep the gun from bursting. Because of their rounded contours, Dahlgren guns were nicknamed "soda bottles", a shape which became their most identifiable characteristic.[1]​: 203 ​