Piggman1.........I was right ! (Hollow inside). Check out my reply #15 on page 1 of this thread. I know you said there are no seams on the first three, but this last one being so similar and revealing that it is hollow, is strong evidence in favor of them all being hollow. There are several reasons for hollow construction : #1 Less material cost, #2 Facilitate manufacturing, #3 To enable something to be placed inside....something that makes no sound when shaken...a rolled piece of paper for example, and #4 So the trapped air inside will make them float ! lol
My guess is, they are all hollow, but were
plated, which covered the seam. One way to get a good indication as to whether or not the first three are hollow, would be to weigh that last one you found, then add a little for the missing end cap to get a total weight. Then weigh one of the first three and see if there is any significant difference. And just for curiosity, drop one of the first finds into a bucket of water, to see if there is any indication of buoyancy. Conversely, hold it at the bottom of the bucket, let go and see if it has a tendency to rise.
If you determine the first finds
are hollow, then decide if it's worth trying to force off one of the end caps, to possibly gain some information.
I know it's a long shot that there is anything inside that will help to identify what these
things were made for, but hey, we need a diversion here......our BioProfessor is about to go nuts over these nuts (he will have plenty of company too) if this isn't solved soon!
One last thought, since the street is fairly close, perhaps the thingy's were thrown from the window of a car and have no relationship to the field area where found !
Good Luck,
Todd
![:-\](https://www.treasurenet.com/smilies/undecided.gif "Undecided :-\")
