Hello All,
I'm probably the only one who missed these but while searching for river gunboat photos, drawings etc. I came upon a new (well to me anyway) bunch of drawings from Service Historique.etc.
I can't give a direct link because it seems to divert to the normal ones. I.e. the full ship plans.
These (new) ones are a random lot of single sheets with plans of sailing ships, boilers, engines, harbours etc. They're not all French, so I've put some oddities here.
I've got to it after googling "chaloupe cannonieres" and following the Service Historique entry about 10 down.
Tony
PS The last one shaows the pneumatic guns on Vesuvius
