Unknown brass/copper item from known Union encampment site

[jayutica]

I know what the two on the outside of the pic are, a knapsack/ tent rivet and a chewed bullet, but the item on the center has me stumped; dimensions are 9/16ths in. wide at rim, 5/16ths in. high, with smaller inside diameter of 7/16ths in. The outside of the center is threaded, any ideas Thanks

 

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[trikikiwi]

Maybe a rivet or half a rivet
Mike

 

[CRUSADER]

oil can lid

 

[Montana Jim]

It kinda looks like a expansion plug or something... but at 7/16" ?

 

[Angelo]

Could it be a cap for artillery shells, placed for transportation prior to inserting fuse?

Musket caps? Found the following pic. and don't know what they are used for though.

Question: Are those real threads or just straight ribs?

 

[jimbob450]

Those look like percussion caps for black powder rifle
or pistol. Jimbob

 

[Bigcypresshunter]

Could it be a cap for artillery shells, placed for transportation prior to inserting fuse?

Musket caps? Found the following pic. and don't know what they are used for though.

Question: Are those real threads or just straight ribs?

Your pic, Angelo, is of fired muzzleloading caps... too tiny. Musket caps are larger but I dont think so..

 

[Angelo]

Thanks!

Had no idea.

Tony

 

[jayutica]

Question: Are those real threads or just straight ribs?

They are definately threads

 

[Bigcypresshunter]

Question: Are those real threads or just straight ribs?

They are definately threads

With those threads it looks like the little plug that holds the bulb in place on old time flash lights

Will a small light bulb screw into it?

 

[trikikiwi]

With those threads it looks like the little plug that holds the bulb in place on old time flash lights

Sorry to go off at a tangent but, just-geese, can you explain their use in more detail or send a pic because I suspect you might have the answer for another Whatsit? thread of a couple of months ago.
I'll try and find it again and post the link here.
Mike

Found it
http://forum.treasurenet.com/index.php/topic,160744.0.html

and again - Sorry to hijack this thread

 

[jayutica]

Question: Are those real threads or just straight ribs?

They are definately threads

With those threads it looks like the little plug that holds the bulb in place on old time flash lights

Will a small light bulb screw into it?

No, there are no internal threads, only external. The inside is smooth

 

[lonesomebob]

my best bet is that is one half of a grommet. used for strengthing a hole in canvas or web. have installed many of em. Bob

 

[jayutica]

my best bet is that is one half of a grommet. used for strengthing a hole in canvas or web. have installed many of em. Bob

Makes sense, but would there be a hole thru the center or would it be punched out when it is attached