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Reading a ruler help, 1.2 or 1.02

Discussion in 'General Electronics Discussion' started by computer-joe, Dec 24, 2017.

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  1. computer-joe

    computer-joe

    29
    6
    Oct 6, 2016
    help! i need some ruler help,

    Im making a project on photo shop. I had to measure a paper cover i own


    it measures 1.something by 1.something

    i need to put that in photoshop, but the problem is i don't know the correct reading.


    Would it be 1.02 or 1.20


    here is a picture of that

    cm-clipart-13.jpg
     
  2. Cannonball

    Cannonball

    191
    53
    May 6, 2017
    1.2 and 1.4
     
    hevans1944 and davenn like this.
  3. Bluejets

    Bluejets

    4,608
    977
    Oct 5, 2014
    Half way between 1 and 2 would be 1.5 so it follows that 2 units out would be 1.2 and 4 units out would be 1.4.
    Merry Christmas :)
     
    Harald Kapp and hevans1944 like this.
  4. kellys_eye

    kellys_eye

    4,275
    1,147
    Jun 25, 2010
    :rolleyes:
     
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  5. hevans1944

    hevans1944 Hop - AC8NS

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    Jun 21, 2012
    o_O
     
    Bluejets likes this.
  6. dorke

    dorke

    2,342
    665
    Jun 20, 2015
    Well,
    Since you asked,(it is quite obvious to most people),
    here is a simple way to deal with these kind of linear scales:

    Each CM(biggest bars) is divided into 10 equally spaced smaller bars with one medium sized one in the middle.
    It should be interpreted like so:

    Each small bar is 1/10 of a CM (0.1CM).
    The mid bar is 0.5CM.

    That would work for all types of linear scales.

    People used to CM scales take that(decimal system 1/10) to be an obvious thing.
    When they switch to Inches they have a problem understanding the power of 2 system(1/2,1/4 1/8,1/16 etc.)

    reading-a-ruler-7-638.jpg cb=1396610561.jpg


    Isn't it about time to throw away that ridiculous inch system ?
    Who in the world still uses it ,(USA and...)?
    Apart from the difficulty of switching ,why ?
     
    Last edited: Dec 24, 2017
    hevans1944 likes this.
  7. Bluejets

    Bluejets

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    Oct 5, 2014
    Ah yes, but, it's quicker to say "knock off an extra thou" than it is to say" knock off an extra zero point zero two five millimetres". :p

    Edit: for the machinists out there ....:)
     
    hevans1944 likes this.
  8. hevans1944

    hevans1944 Hop - AC8NS

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    Jun 21, 2012
    Yeah, I have trouble even seeing those itsy bitsy teeny weeny marks on a steel scale that is marked off in 1/64" increments. And it seemingly gets worse when that inch scale is only divided into fifty linear increments instead of sixty-four. I usually keep a set of vernier calipers with a dial indicator or a digital readout handy to verify that I've read the scale correctly.
     
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