For first time visitors I recommend this archive for some of my best posts.
1759. 19" long:
1760. 9" long, patented in 1951:
1761. 10-1/2" long:
1762. Sent in by a visitor, text on it reads DC10, 767, and 380:
1763. The round part is 2" diameter, on Thursday morning take a look at Neatorama for more guesses on this one:
1764. Submitted by a visitor who is looking to find the purpose of this item, the jar has no bottom but is ground perfectly flat, it measures 5" diameter x 12" tall, the brass fitting is 3-1/2" x 11", the tube measures 5/32" I.D. and is grooved as if a tube would be attached. Brackets at the ends of the arms apparently would clamp 1/4" rods.
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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.