1339. A woodworker's dovetail layout gauge, a slightly different one can be seen here.
1340. An exerciser, patent number 1,638,196.
From Stan Seevers' collection
1341. Still don't know what this was for, most people guess that it's related to either dining or religion.
1342. A tail pipe expander, used for exhaust system repair and installation, or to remove the crimps caused by u-bolt clamps.
1343. Thanks to Steve for sending the answer for this one:
"This is a rifle barrel inspection device; the 45 degree mirror is missing from in the aperture in the side of the tube. I have one identical to this. I was told that all soldiers were issued one as part of their kit."
Similar to patent number 7,180,587, there is also a fiber optic device for the same purpose.
The tube is open on both ends.
To submit photos, click on the profile link at the upper right to find my email address.
Last week's set is seen below, click here to view the entire post:
Black Ops Pro Tips
More discussion and comments on these photos can be found at the newsgroup rec.puzzles.