Steve,
David P wrote:
Quote:
that "ledge" or seam cover that partially wraps around the bent joint of the starboard vent trunk, make it wider as there is an electrical or air driven hand tool sitting there in the red circled picture
. See my comments below about altering the width of that flanged joint.
It is NOT an elec. or air tool, it is an alarm - see blowup below:
Attachment:
Stbd Vent with Horn.JPG [ 34.07 KiB | Viewed 6167 times ]
Remember, this is 1940's era and many mechanical/pneumatic items were utilized in conjunction with newer electrical switches and activators to produce things such as a powered air alarm. This alarm is also mounted on the outside of the port vent shaft and a similar one is mounted below an elec. panel box on the stbd side of the main deck break bulkhead. I've shown this on my vent drawing in red.
As for the vent shaft lip that DavidP describes, it
could be up to 2 1/2w x 1" deep. It's a 90 deg. angled lip connection and probably has a neoprene seal inside.
Not to get into a pissing contest over who has more or what experience as a draftsman, I have been a facilities board/CAD draftsman/designer for 46+ years and currently work in piping, HVAC, and P&ID CAD drawings in a project engineering group designing a new plasma fractionation facility at our N.C. location. I'm quite familiar with how HVAC ductwork is engineered/designed/drafted and these items in a shipyard would be pretty std. items for the time. Things today, however, are done quite differently as a matter of info. I'm not sure whether or not these are intake or exhaust vents, but I'm leaning towards exhaust due to the hinged deflector panels. The BoGP for ARIZONA only calls hers "vents" with no further description.
Hope this helps,
Hank