1843. 1-3/8" long, take a look at Neatorama for more guesses on this one and a chance to win a T-shirt:

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1844. 6" long:

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1845. 10" long, over 3000 years old:

1846. 3-1/2" long:

1847. Sent in by a visitor who is looking to find the purpose for this device, text on the left side says 'minus', and on the right 'plus', both sides have increments from 0 to 500:

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1848. The upper part is approximately 24" tall:

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Answers:
1843. A probe from a policeman's Taser:

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The Taser:

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A Taser cartridge:

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An older model:

1844. A playing card holder for two decks:

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1845. An Egyptian headrest, it was marked "New Kingdom, later Dynasty 18, 1400-1300 B.C."

1846. Part of a hay elevator and carrier, this piece of hardware was used to keep the hay fork at the desired elevation, check out figure 3 in patent number 328,896.

1847. The most popular guess for this is that it was for keeping score in some type of game:

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1848. The bars from an old jail cell window:

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More discussion and comments on these photos can be found at the newsgroup rec.puzzles.