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  1. #1
    Join Date
    Mar 2007
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    Philadelphia PA
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    Default Behold, The Mystery Sphere!

    OK, Oldsters. Anyone have a clue what this things is? House is 124 years old.


    mystery sphere.jpg

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  2. #2
    Join Date
    Mar 2007
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    Philadelphia PA
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    Default Re: Behold, The Mystery Sphere!

    Quote Originally Posted by Robert Meier View Post
    Looks like an old Edwards heat detector.

    Look here scroll down:

    https://forums.thefirepanel.com/view...=4223&start=45
    Yes it does! Thanks!

    "There is no exception to the rule that every rule has an exception." -James Thurber, writer and cartoonist (1894-1961)
    www.ArnoldHomeInspections.com

  3. #3
    Join Date
    Dec 2009
    Location
    Florida
    Posts
    552

    Default Re: Behold, The Mystery Sphere!

    Quote Originally Posted by Robert Meier View Post
    Looks like an old Edwards heat detector.
    Actually they are not that old and are commonly referred to as "Rate-of-Rise" detectors. They respond to rapid changes of temperature such as caused by a fire just starting out, as well as a fixed temperature. A common way to test them is to just place your hand on the unit. The change of temperature from your hand would set set them off.


  4. #4
    Join Date
    Aug 2011
    Location
    Bennett (Denver metro), Colorado
    Posts
    1,394

    Default Re: Behold, The Mystery Sphere!

    Quote Originally Posted by Rich Goeken View Post
    Actually they are not that old and are commonly referred to as "Rate-of-Rise" detectors. They respond to rapid changes of temperature such as caused by a fire just starting out, as well as a fixed temperature. A common way to test them is to just place your hand on the unit. The change of temperature from your hand would set set them off.
    My wife always tells me that I have cold hands, I wonder it that works for me.

    If you choose not to decide, you still have made a choice.

  5. #5
    Join Date
    Dec 2009
    Location
    Florida
    Posts
    552

    Default Re: Behold, The Mystery Sphere!

    Quote Originally Posted by Lon Henderson View Post
    My wife always tells me that I have cold hands, I wonder it that works for me.

    That's making it warmer!!!! Not colder!!!!


  6. #6
    Join Date
    Jun 2010
    Location
    Morris County, New Jersey
    Posts
    39

    Default Re: Behold, The Mystery Sphere!

    And, these older rate-of-rise heat detectors are a major PIA for firefighters since they often false alarm with changes in weather / barometric pressure. Climate change will probably cause them to all go off together sometime in the next two or three thousand years. Better add it to your reports...


  7. #7
    Join Date
    Mar 2007
    Location
    Hudson, WI
    Posts
    645

    Default Re: Behold, The Mystery Sphere!

    Quote Originally Posted by John Arnold View Post
    OK, Oldsters. Anyone have a clue what this things is? House is 124 years old.
    It's not 124 but definitely a heat detector that was in use since at least the early '60s


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