Additionally, the command chair and helm/nav console both appear to be closer to the far wall than on the "bigger ships", implying that the bridge itself might be smaller, and possibly oval.
...In practical terms, what seems to have happened is that the console wedges, helm pulpit and so forth (all separately moveable) were shot at a separate location, on a flat floor, for some unknown reason, rather than on the usual soundstage.
The "oval" thing would come from the use of less than a full circle's worth of wedges (essentially just the aft port one-third), necessitating confined shooting angles that couldn't quite reproduce the circular illusion.
Who knows, perhaps there was an intent to construct another cheapo set for the science ship, but it turned out that the "cheapo"
Excelsior wasn't that cheap after all and the
Grissom had to be made of leftover bits of one of the other two bridges. And the
Enterprise one was chosen, for the better quality of the elements and for preserving the "futureness" of the other design. Yet perhaps Stage 9 had already been torn down with the assumption that the
Grissom scenes would be shot elsewhere, and placing the elements on a flat floor was all they had the time and the money for.
Or then this was actually done to make the
Grissom look smaller, and damn the costs of not reusing either of the other two bridges as is!
Timo Saloniemi