Thursday, April 18, 2013

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

10 comments:

  1. 2849: a part of a "sickle bar" or "finger-bar" mower
    http://de.wikipedia.org/wiki/M%C3%A4hbalken
    2850 looks like a scope mount ring of a gun
    b.

    ReplyDelete
  2. 2847 - this gets set in concrete to create an anchor point for a cable/guy wire etc.

    2848 - Call button for an elevator

    ReplyDelete
  3. 2849 is the finger off a finger bar mower

    ReplyDelete
  4. 2845 are coin blanks. Put into a high pressure die and you have pennies, quarters, etc...

    Total guess BTW

    ReplyDelete
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    ReplyDelete
  7. It seems strange 2847 would be a permanent anchor, when the success relies on a small cotter pin/spring clip on the bottom side.

    ReplyDelete
  8. 2846 resembles a slide out writing surface similar to that in a desk or card catalog, but I don't think that it is one. But I do think that it is part of a bigger piece of furniture.

    ReplyDelete
  9. 2849=Actually removable"guard" with wearplate fore sickle bar mower.Sickle bar with row of triangular blades slides left and right within a row of the item shown creating a scissor like action.Guard as shown guides grasses into blades and protect blades from rocks and debris.

    ReplyDelete