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#1
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Quote:
A helix of ink around a cylinder is created - like a spinning barber shop pole. If the stripes were ink, they would produce diagonal lines on a piece of paper. Last edited by SetBuilder; 06-25-2018 at 04:08 PM. |
#2
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I'm not trying to be argumentative, just interested in the idea and would like to understand it better. Here are the two main reasons why I don't think we are looking at "gear streaks"
1. The lines are definitely not "straight". They follow a general direction but are not a straight line. 2. The Plate Scratches follow the exact same pattern every time. For two of the Plate Scratch patterns, there are two different sheets with the exact same pattern on the back, but a completely different set of fronts. The backs allow us to re-create what the sheet looks like, which Pat has done. If it was just a random malfunction of the press, I can't imagine that the pattern would be exactly the same every time.
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ThatT206Life.com |
#3
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1. They're straight, but sometimes shaky. I've seen most of the photos posted on this thread and the shaky lines could possibly be due to vibration. They're definitely straight lines more often than not. 2. Do you mean that the lines appear on the backs only and not on the front? I think this is because the last stop (or first) on the press was the printing plate for the back design. Last edited by SetBuilder; 06-25-2018 at 04:21 PM. |
#4
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No. The term "gear streaks" sounds like they are random streaks on a sheet.
The Plate Scratches are a pattern that was repeated over and over on each sheet. Pat has stacks of the same player with the same exact Plate Scratch on the back.
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ThatT206Life.com |
#5
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Well, I think it's more explanatory than "plate scratch," since the printing plates were relief and not intaglio. A scratch on a relief plate would be void of ink.
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#6
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Hi Manny,
The gear streak information is interesting thanks for posting about them. I agree with Steve and Luke I don't think that's what caused the plate scratch marks. From what I understand the gear streaks wouldn't be repetitive and the plate scratches are. As Luke pointed out the same exact scratch can be found on the same subject multiple times and on some sheets they same exact scratch can be found on two different subjects. Konetchy Group.jpg Konetchy Group Front.jpg Doyle-Stone.jpg Doyle-Stone Front.jpg |
#7
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Perhaps they're not "gear streaks" as I understood the term from the definition I found. There may be another term for the streaks in pressman nomenclature. One of these days if I have time I'll venture off to a printing forum and ask there what the streaks are called. I still think my theory is correct. If you believe the Library of Congress' classification of T206 cards as relief prints, and you also assume that the owners of American Lithographic stuck to their area of expertise and operated a multi-color offset press, then the only valid explanation is that the scratch was on the rubber blanket roller and not the printing plate. The Occam's razor explanation is that some kind of machine feed malfunction caused the rubber roller to bounce up suddenly, grazing the surface of the relief plate at a high speed, thus causing a scratch on the surface of roller which would hold ink and transfer to the card in the same spot each time. Either that, or simply that the roller became worn and scratched with use. Because of the constant spinning of the roller, the scratches took the form of a helix wrapping around the cylinder, which translated into diagonal lines on the paper. The steepness of the scratch I guess depended on the speed of the press when the scratch occurred. Last edited by SetBuilder; 06-25-2018 at 08:38 PM. |
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