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  1. #11

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    Okay. I think I get it now. Is the bottom of the center portion of the "C" recessed compared to the outstanding legs? I am assuming it is, and that the legs straddle the film/paper base, right?

    Assuming the above is correct, why use two screws at each end instead of spreading them out along the blade to give better support? I'm guessing that my conservative nature is coming out and that the blade is stiff enough and the emulsion viscous enough that you don't anticipate much deflection in the blade?

  2. #12
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    Quote Originally Posted by Terence
    Okay. I think I get it now. Is the bottom of the center portion of the "C" recessed compared to the outstanding legs? I am assuming it is, and that the legs straddle the film/paper base, right?

    Assuming the above is correct, why use two screws at each end instead of spreading them out along the blade to give better support? I'm guessing that my conservative nature is coming out and that the blade is stiff enough and the emulsion viscous enough that you don't anticipate much deflection in the blade?
    Terence;

    The blades you see are sitting on the surface that rides on the support. You have things rotated 90 degrees in your mind. The surface contacting the support is polished mirror bright and is square, and that is part of the price problem. There can be no leaks around the edges or under the flat part. The corners that lead the direction of motion are chamfered to allow smooth movement without catching or grabbing. There are a lot of features not apparent in these photos. These are my 4th generation of blades.

    The trailing edge of each blade is the movable plate which is raised up by a varying amound by means of the 4 screws, so when you are looking at the screws you are viewing the trailing edge of the blade.

    The emulsion flows under that gap and is held at a constant laydown by that gap.

    The 4" blade weights about 1 pound, or about 430 grams, the 8" blade is about twice as heavy. The end cap is heavy enough stainless to prevent any fluctuations. The 8" blade uses a heavier end cap than the 4" blade for just this reason. The weight is high to prevent wobble during coating. It is a high end stainless to prevent corrosion from the chemicals used.

    BTW, a similar blade is used in the paint industry to evenly spread paint during tests. These blades are only 4" wide and are made of aluminum. The last time I queried the company these blades were $1200 each. I can no longer locate that web page. I guess they went out of business. At the time though, Kirk Keyes directed me to this additional use of this type of blade. I didn't go with one of these, as aluminum is not compatible with emulsions.

    PE

  3. #13

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    I just love this thread...

    Here I am, trying to get 4x5 developing right, and you are coating your own film... I've got LOTS to learn!

    Keep it up!

  4. #14
    Ole
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    I want one - or two - or three! ...

    As soon as I can afford one, which seems to be further and further off.

    Maybe I should stop looking for strange old things on ebay? Or perhaps it would be easier and less painful to stop smoking...
    -- Ole Tjugen, Luddite Elitist
    Norway

  5. #15

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    Quote Originally Posted by Ole View Post
    Or perhaps it would be easier and less painful to stop smoking...
    Probably as difficult. But definetely more healthy. ;-)

  6. #16

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    Quote Originally Posted by Photo Engineer View Post
    <snip>George Eastman House was the first customer</snip>
    Is that a retirement home for ex-emulsion engineers?

    -R

  7. #17
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    Quote Originally Posted by reggie View Post
    Is that a retirement home for ex-emulsion engineers?

    -R
    If you don't know what George Eastman House is ................

    Nuff said.

    PE

  8. #18

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    Quote Originally Posted by Photo Engineer View Post
    If you don't know what George Eastman House is ................

    Nuff said.

    PE
    Hey Ron:

    The nurse said to take off the lab coat, put down the computer and come down to supper. You can get back on the computer after I've had my turn.

    -R

  9. #19
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    Well, I did just come out of the darkroom, I hung up my lab coat, and I'm now answering about 2 hours worth of e-mail and adding to posts here, including this one.

    Happy?

    I would love to retire to GEH. It is a photographers dream home. The darkrooms there are first rate! So is the library.

    PE

  10. #20

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    Quote Originally Posted by Photo Engineer View Post
    I would love to retire to GEH. It is a photographers dream home. The darkrooms there are first rate! So is the library.
    PE
    That's all fine, but how do you plan on making it past the silvery gates at GEH?

    BTW, please e-mail me or PM me on the state of my 12x20 blade, ok?

    Thansk, Ron.

    -R

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