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Smithsonian's HOOKLESS No. 2?

    When it comes to HOOKLESS No. 2, to me, 
    it means the picture on a website
    that The National Museum of American History,
    one of the Smithonian museums provides.  See the site →

    I've been doubtful for a long time that the zipper on the page is really the No. 2.
    But the picture was too small to check the details.
    Then I got the following enlarged image of the original No. 2!

                 HOOKLESS No. 2 ???
              (Courtesy of Prof. Robert Friedel)

    It seems to be ... the No. 3, not the No. 2. 

    Can you tell the difference bewteen the following pictures? 

    Patent 1219881 (1917) 
    Patent 1243458 (1917)
    the No. 2: left   (U. S. P. 1219881) 
    the No. 3: right (U. S. P. 1243458

    Very sutle, but the shapes of the tooth are different. 
    The bottom of the center of the tooth on the right patent was slightly cut.

    As I wrote it on my book ZIPPER GEAR,
    HOOKLESS No.3 had been treated as a vacant number
    in Hookless Fastener Company.

    Professor Friedel of the University of Maryland, wrote in his book "Zipper," 
    "David Conner (personal communication) has speculated that the No. 3 was the fastner design
    featured in the patend Sundback applied for in April 1915 (issued October 1917 as U. S. P. 1,243,458),
    in which the design of the scoop in the No. 3 was modified, ... "
    Please refer to his book to page 264.
    Mr. David Conner is the late vice president of the former Talon. 

    The company didn't have to distingush the No. 3 from the No. 2 
    because they probably thought there was no big difference.
    But why, then, was the new number "three" put on the modified zipper?

    I specurate that the change of a mold had showed a big difference.
    The firm had to change molds to produce new shaped tooth; No. 3.
    It must have been a big event back in 1915 when Hookless Company 
    was just a small town factory with about 20 people in total.

    Using the No. 3 brought in some improvements on zipper's flexibility.
    Although Sundback didn't want to put the same number on the new tooth,
    Hookless Company couldn't see any merits to differ them.
    As a result, the No. 3 had remained missing in history.  
    This is my hypothesis.

    I failed to ask Mr. Conner about the episode
    when I succeeded in intereviewing him in 2006.
    He had some health problems so I didin't want to disturb him
    by those detailed questions.
    Also there were many other things that I had to figure out with his support. 
    Now, this question will never be answered
    because he passed away two years later (in 2008).

    ☆ ☆ ☆

    What if the Smithonian could show us the original one on the picture of their website, 
    I could recognize it; either the  No. 2 or the No. 3.
    Rumors say, however, the museum have lost a large amount of original colleciton
    and documents donated by the former Talon 

    when their storage or something was moved out several years ago.
    I hope it is not true, but I'm too scary to ask them what the truth is.

    The book ZIPPER GEAR was refused to  accept a donation by the museum
    before it even see inside of the book with the reason it is written in Japanese.
    I feel very sorry that the Smithonian doesn't seem to be passionate enough about the zipper.

    But I have to write about this:  
    The library of the Smithsonian National Air and Space Museum 
    houses FULL GEAR. I appreciate the institute was gradly accepted my first book
    for both collectors and researchers

    ☆ ☆ ☆
    How to order 
     〜full of valuable pictures〜
    | zipperman | 19:19 | comments(0) | - | - |


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