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  1. #21
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    Quote Originally Posted by L Vanice View Post
    When I was in school in the 1950's, I saw a huge slide rule in a classroom. It was a teaching aid, commercially made for the purpose. I used a Pickett 10 inch slide rule, bought in 1958.

    Here is a link to a website showing some of those large slide rules.

    https://www.sliderulemuseum.com/DemoSR.htm

    I suppose a large micrometer could have been made for a similar purpose.

    Larry
    58 dam that's my birth year . i use to buy slide rules at the swap meet years ago still have them somewhere never used one but i just think there cool . they were green before green was green . ya right who cares . but they were the i pad of there day.

  2. #22
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    Sent from my iPad using Tapatalk

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  4. #23
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    dads-micrometer.jpg
    My Dad made this in 1950 as his High School Senior shop project. It is an exact 1"=5" scale copy of a Brown & Sharpe #13 micrometer. You can see a standard 1" model in the photo. Everything works including the ratchet and lock. It measures to scale. He also drew the blueprints and engraved all the markings with a hammer and engraving tool. The school used this for a teaching aid until the shop program was shut down. The last instructor tracked him down and returned it too him. Besides a bunch of awards for the work, he was hired by Singer Sewing Machine directly into the Apprentice Toolmaker program. Dad retired from Singer as the Senior R&D Engineer with over 62 patents. It shows what a good shop program can do.

  5. #24
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    Quote Originally Posted by Hit Miss Engine View Post
    That was my thinking… a neat piece to stick on the wall or hang with some small heavy wire or cables from the ceiling.
    if I hung that from my ceiling I'd be hitting my head on it daily.

  6. #25
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    Somewhere I've seen a picture of a classroom with one of those big mics in it for teaching how to read a mic. L Vanice is surely correct.

  7. #26
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    A 37" micrometer might qualify as "big" but not giant when compared to the 66" Starret's (and smaller) that were used in the Roll Shop at the plant where I spent almost 30 years.

    JH

  8. #27
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    Quote Originally Posted by James H Clark View Post
    A 37" micrometer might qualify as "big" but not giant when compared to the 66" Starret's (and smaller) that were used in the Roll Shop at the plant where I spent almost 30 years.

    JH

    Difference is those were large mics for large work.

    This one is basically a 1" mic in proportions, but made 37" long..... about 6 or 7 times actual size. Not practical for use, clearly made large to be visible to a classroom of people..... teaching tool, most likely.


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