Actually, now I am sure it's a porthole:
http://www.mjtsc.pwp.blueyonder.co.uk/new/images/image75.jpg
In that shot, it looks more like a protruding reddish cylindrical shape, probably identical to the circular reddish feature in the bottom right corner of that photo. If you look at the top of the shape, it's flat, like a hockey-puck shape seen a bit from the side. Although I will admit that there's no hint of such protrusion in the overhead angle you posted.
But if it is just like that forward feature, then I guess it isn't a switch, just a slightly protruding light fixture.
That's a given. It's explicitly stated in the bridge log tapes in the episode: "We'll need somebody in the pod for readings." Spock then orders Finney to "Report to pod for readings on ion slates" (or so says the closed captioning -- some people in this thread have said "plates," suggesting something analogous to photographic plates for X-ray instruments, say), and Finney later reports "Ion readings in progress." The ion pod was quite clearly depicted as a scientific instrument.
I imagine the pod might be something that extends a telescoping antenna/probe out into the storm, kind of like a lightning rod. The pod and its extended probe are insulated from the body of the ship proper, but an intense enough charge can jump the gap, so the pod must be jettisoned if the storm's energies grow too intense (since it might not be possible to discharge the pod safely past that point).
I guess that depends on how big the storm is and how feasible it would be to fly around it. Although I assume that an ion storm is typically a coronal mass ejection from a star (I've even seen the term used that way by scientists at least once), it's possible that some ion storms are larger, similar phenomena, maybe interstellar plasma clouds energized by distant gamma-ray bursts. I'm fairly sure there are episodes referring to ion storms that are too big to steer around.
Who says he had a master plan? I've always seen it as an extemporaneous decision. His hatred for Kirk had been festering, and when he happened to get the ion pod assignment during an intense storm, it suddenly occurred to him that if the pod were to be jettisoned, he could jump out just before and hide in Engineering, and people would think he'd died.
Sure. But an instrument dedicated to protecting the ship? Or an instrument dedicated to abstract science, at the risk of harming the ship?
The writer probably rather intended the latter, but the story in context suggests the former instead.
Indeed. But it is equally possible to read the dialogue as indicating that the pod is going to be launched, that the readings on the ion slates are launch preparations, and that Red Alert or Force Seven storm intensity is the right time to launch the pod as planned, so that it can either a) start playing a role in saving the ship from the storm, or more probably b) initiate the planned-for experiments so that Kirk can finally fly out of the damned storm and leave the instrument to its fate.
In fact, ENT "Catwalk" suggests that (at least some) ion storms move at high warp speeds, making it impossible to evade them even at warp 5'ish. That would jibe with the idea of such a storm (or "magnetic storm") sweeping the old Valiant across significant interstellar distances, even though it removes the ion storm from the category of known natural phenomena. Annoyingly, it also contradicts Kirk's assertion in "Obsession" that natural phenomena of that sort should not be capable of warp...
But Kirk never even makes an attempt to flee. There is no indication he is in a hurry to get to a specific destination, either, so turning tail would certainly make sense in view of the witnessed hazards.
Who says he had a master plan? I've always seen it as an extemporaneous decision. His hatred for Kirk had been festering, and when he happened to get the ion pod assignment during an intense storm, it suddenly occurred to him that if the pod were to be jettisoned, he could jump out just before and hide in Engineering, and people would think he'd died.
Not really plausible, as the plan would require extensive tampering of computer records (something the Records Officer could easily do, but also something the supposedly deceased, former Records Officer could not), not to mention preparing a hideout where he could survive for weeks.
I think they are meant to be visually evocative of the load line markers near the waterline of a ship -- but vertical instead of horizontal. As far as any real-world significance, MGagen discovered that the numbers, if multiplied by .25 (1/48 scale) reveals an overall length of (IIRC) 540 feet -- the original conjectured length of the ship. He used this as evidence that the model had originally been intended to be 1/48 scale and reflective of a 540 foot long ship.
Actually, now I am sure it's a porthole:
http://www.mjtsc.pwp.blueyonder.co.uk/new/images/image75.jpg
In that shot, it looks more like a protruding reddish cylindrical shape, probably identical to the circular reddish feature in the bottom right corner of that photo. If you look at the top of the shape, it's flat, like a hockey-puck shape seen a bit from the side. Although I will admit that there's no hint of such protrusion in the overhead angle you posted.
But if it is just like that forward feature, then I guess it isn't a switch, just a slightly protruding light fixture.
I'm pretty sure that "circular reddish feature in the bottom right corner" is also a porthole, but we'll never know until one of us gets there to make sure. I'm scheduled for a meeting at the National Museum of the American Indian on Thursday, so I'll try to go next door to take a peek, with camera.
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