Set 489

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2845. Take a look at Neatorama for more guesses and a chance to win one of their funny T-shirts.

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Mean length, uncompressed .3998", Mean diameter, uncompressed .2260"

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2846. 25" long:






































2847. 12" tall:

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2848. 31-1/2" x 4-1/2", someone is looking to find where these mirrors are from, they have a push button at the bottom and text that reads "Mortimer.XI & XII", and "2014":








































2849. 7" long:

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2850.























Answers:


2845. These are copper crushers or copper pressure cylinders from the Frankford Arsenal, according to this article:

Until the mid 1960's the only method commonly used for measuring chamber pressures was the copper crusher. Basically, a hole is drilled in the chamber of a firearm and a crusher chamber is attached to that hole. In this crusher chamber is placed a very precisely manufactured piece of copper.

When the gun is fired the copper pellet is crushed (deformed) by the pressure to some degree. The amount of this deformation is then precisely measured and a very standardized indication of pressure is determined.

To this day, most published chamber pressure (MAP) data for metallic cartridges is taken by the copper crusher method of measurement. The proper name for this type of measurement is CUP, or Copper Units of Pressure.

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2846. No answer yet for this item:






































2847. Also not sure about this one, the most common suggestion for it is that it's an anchor for some type of cable, with the bottom plate buried in concrete:

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2848. These mirrors are possibly from the Mortimer Building in New York City, the buttons could have been for calling the elevator:








































2849. This is a guard from a sickle bar mower:

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2850. A scope mount for use on a rifle:










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