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 Took a dry plate from a carrying case.

* * * * * * * * * *

Don't worry! Pynchon's getting to the point of these short sentences! Here's the third in a row as Merle begins to learn the process of developing a photograph. The short sentences indicate it's all easy enough for Merle to keep up and process. Door shut. Ruby light on. Dry plate out. The magic is happening! Or, as Merle's finding out, the magic doesn't actually exist and it's all just boring, drawn-out explication.

"dry"
Boring. Dull. Oh, and literally, not wet.

"plate"
Loads of non-literal definitions for this but following on "dry" as "boring", we have an object on which nourishment is served.

"carrying case"
Where Roswell keeps his secrets. He has thus taken them out into the open to give them to Merle as he currently discovers the process of learning how to develop a photograph strips away the easy magic of snapping a photo.

I know I basically said all of that in the first paragraph but I'm making corn grow too!

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 Roswell lit a ruby darkroom lamp.

* * * * * * * * * *

"lit"
First and foremost, the beginning of the process. The creation of the light needed in the dark, a light that somehow retains darkness. But second and hindmost, the journey has begun; they have lit out for the territories.

Once again, a short sentence. Perhaps because Merle's learning something new, we're taking it nice and slow. Or, as I mentioned in the previous post, Pynchon's continuing the slow as corn growing metaphor.

"darkroom"
According to Merriam-Webster, the first use of darkroom was in 1841, just thirty-six years prior to this scene. More words coined in 1841: "self-care", "hanky-panky", and, just because it's interesting to me as I'm currently reading Danielewski's Tom's Crossing, "clop-clop".
    The darkroom probably has deep and symbolic meanings in the context of this book which begins with the Monk quote, "It's always night, or we wouldn't need light." Perhaps the darkroom is the antithesis of the quote, even. The idea that it's always light or we wouldn't need a darkroom. We couldn't process photographs, caused by light, without shutting out that same light but seeking to obliterate now instead of create.

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 "O.K., here we go."

* * * * * * * * * *

A nice short sentence that's not quite the starting pistol Merle was hoping for when he first decided to cross over the threshold to learn about photography. We're about to witness how the corn is grown. Nice and slow.

"O.K."
As mentioned previously, I believe, "O.K." stands for "Oll Korrect" because people in the late 19th Century had to make their own fun and spelling things incorrectly was just a major hoot. But unlike Cockney Rhyming Slang, most of this era of language obfuscation didn't survive.

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 As a mechanic he respected any straightforward chain of cause and effect you could see or handle, but chemical reactions like this went on down in some region too far out of anyone's control, they were something you had to stand around and just let happen, which was about as interesting as waiting for corn to grow.

* * * * * * * * * *

Pynchon forces the reader to contemplate two vastly different aspects of our universe: things in which we can observe directly the way they work and those things we observe through evidence and experiment alone. Is he hinting at the stark difference between general relativity and quantum mechanics? Is he making a sly joke by identifying a "mechanic" with the big trappings of the universe who is mystified by the unseen that he can't get his hands on?

"any straightforward chain of cause and effect you could see or handle"
This feels like an excellent summation of the kind of "common sense" that mediocre people pride themselves in having. It also seems, in the context of the current discussion on light and Æther, a bit of irony in the use of the term "straightforward". Only perhaps in the machines Merle builds and repairs can one look at the universe in this straightforward chain of cause and effect. You can see what moves when you turn a crank. You can follow the path of a belt to see how it causes movement within a structure. In the same way, people might think their observations of the universe can be interpreted just as straightforward. But as Merle goes on to explain, much of the world takes place "in some region too far out of anyone's control."
    But let's get even further into the subtext. Could Pynchon be speaking about writing here? Merle respects plot which happens right on the surface where you can follow characters' actions and motivations which move the story forward. But the subtext, the chemical reactions, need deeper thinking to see and understand. Maybe Pynchon's even hinting at how the author sometimes loses control of the subtext ("too far out of anyone's control"), seeing as how much can be brought to the text by the reader that wasn't intended by the author. Sort of like 85% of what I've written on this blog.

"about as interesting as waiting for corn to grow"
But to the layman, subtext is boring. Just get to Merle fucking Erlys already and don't make me think about how that means Merle's fallen in love with light itself!

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 Like anybody, of course, he had wondered what happened during the mysteriously guarded transition from plate to print, but never enough to step across any darkroom's forbidden doorsill to have a look.

* * * * * * * * * *

Pynchon has a lot going on in this sentence but first and foremost is his alluding to transubstantiation except in reverse: instead of an object becoming flesh, flesh, in photography, is transformed into an object. He couches it in the "mysteriously guarded transition from plate to print" but that's just allowing Merle to ease into the subject of flesh to print. In the span of two lines, Merle has expanded his idea of photography from an idiot's game to a religious concept.

"mysteriously guarded transition"
Merle will step back slightly from this characterization in the next half of the sentence when he admits that he's in control of where and when he could learn this secret but here, at the start, he sounds like he's a subscriber to the Proverbs for Paranoids. Something guarded must have guards. Rather, Guards, capitalized. As in They. Them. The Masters controlling the information.

"but never enough"
People often become obstacles to sating their own curiosity (and that's if they can even bother to find themselves curious about the nature of things at all). Ignorance comes in many forms but the withholding of information from yourself is the foundation of one of the most common. The most common probably stems from people simply not understanding complex answers to questions and seeking the safety of a simple solution. These are the people who believe they're smarter than the most intelligent people because they have common sense. Common sense feels like intelligence but it's actually just a smokescreen to understanding. Common sense says the sun revolves around the Earth because that's a common and easily digested common observation. But what common sense often just hides is ignorance based on a lack of understanding a complex world where observation isn't the only answer.
    Before you think I've gone off on a tangent, let's observe this: photography becomes an easy allusion to discuss light and vision, a comparative to human perception and observation.

"darkroom's forbidden doorsill"
Pynchon uses "doorsill" purposefully since it's a synonym for threshold, or the point of beginning. The term "darkroom" indicating ignorance and the lack of knowledge, forbidden because the knowledge remains particular to those who study photography and their apprentices. With Roswell's loss of apprentice, Merle has filled the vacuum to be allowed this knowledge. He steps over the threshold to begin his new life as a photographer, a capturer of moments, one who sees and observes particularly well.

"have a look"
Once again, it's observing that's important, with the basic understanding that light is essential for "looking". Perhaps this encounter with photography and the need to understand how light can be used to save images in time and space was needed for Merle to encounter and fall in love with Erlys, a name that means "the light" in Norwegian. Remember, this is the story about how Merle fell in love with Erlys Mills!

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 It had always seemed like an idiot's game, line them up, squeeze the bulb, take the money.

* * * * * * * * * *

"an idiot's game"
Weirdly, I could find no etymology on this phrase. Yes, I only used various search engines on the Internet and not hiring a bunch of research assistants or visiting the local library. Partly this is because the Internet is broken and gives weight to popularity of use. So instead of discovering why this phrase seems to have some weight as an actual idiom, I'm overwhelmed by pages and pages of people quoting some character in Red Dead Redemption 2. Being that the phrase is just two common words stuck together which connote an easily digestible idea, the phrase isn't particularly looked upon as an idiom, even if I saw examples of it used in so many diverse spaces that it feels like a common saying.
    Everybody reading this phrase gets the point so I guess it doesn't need an etymological breakdown in the Oxford English Dictionary. Merle's describing a game that only idiots would play, like Three Card Monty or Russian Roulette. He's hinting at the simplicity of people who fall for fads like this. It's his initial reaction to the entire concept of photography, looking down his nose at a budding new technology that seems to serve no purpose other than to bolster the vanity of those paying for their pictures.

"line them up, squeeze the bulb, take the money"
Wait. Is prostitution also an idiot's game?!
    Anyway, Merle first thought of photography as a scam to take people's cash.

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 Merle was no hoosier on the subject, he had seen cameras before, even had himself snapped once or twice.

* * * * * * * * * *

"no hoosier on the subject"
Pynchon uses the term here to denote a "yokel" and not a "resident of Indiana". This makes sense in context as the rest of the sentence offers proof to how Merle isn't completely inexperienced with the idea of photography.
    I mean, not a lot of evidence! Merle has seen some cameras and had his picture taken. I'm not sure I'd allow that as evidence as to Merle's expertise on the subject. I suppose, this taking place in the 1880s, just seeing a camera and posing for a photo once or twice makes you leaps and bounds more proficient on the subject than the average American hoosier on the frontier.