Set 361

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2077. The base is 15" long:

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These next two items were part of the set seen in the previous photos.




2078. 5" square:




The numbers range from 0 to 100:

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2079. 6" diameter:

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2080. 12" tall when fully extended, take a look at Neatorama for more guesses and a chance to win a T-shirt:






















2081. Approximately 10" long:

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2082. 10" long, from the 1700s, the large part is hollow as is the piece on the upper left which is also open on the end:

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Answers:



2077. A Bausch and Lomb carbon arc microscope projector:

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2078. Probably an old potentiometer, a variable resistor for use in laboratory experiments:

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2079. These are drives for chart recorders that were used in a lab, they are powered by a spring which is wound with the handle, the rod rotates when the drive is on, they could be used to record plant growth, breathing, early EKG, barometric pressure, etc.

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At the top of this picture is a brake to stop the drive:




















2080. A Japanese traveling candlestick, it's missing the part that would have caught the wax:





















2081. A laboratory vacuum pump for a bell jar:

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2082. A powder horn for holding black powder for old firearms:

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Last week's set is seen below, click here to view the entire post.








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