Posting from rec.crafts.metalworking as always.
2185) Looks like an old automobile trouble light, designed to plug into a cigarette lighter outlet.The hook keeps it from sliding away from where it is being used.
What is not clear is why the mechanical shutter instead of a switch in the cord.
Of course -- it could be a timing light, missing perhaps the part to fire the bulb -- but the bulb sort of looks like an incandescent -- though it might not be the original lamp.
2186) If the diagonal part between 3 and 15 on the drawing is a spring or a rubber band, then it is some kind of shock mount, perhaps for something like transporting nitroglycerine or some similarly sensitive product.If there were a pointer of some sort, I would consider it to be possibly a form of scale instead.
2187) Looks like a tool for manipulating the grate in a woodstove, or something similar. 2188) Well ... the central object is a Starrett mechanical tachometer which you have put up before. But I presume you are asking about the wood object just above it instead.That looks like something for supporting a workpiece between centers -- but since there is not a thread on the shaft of the T-handled part, nor a visible thumbscrew for locking it down, instead I will suggest that it is for pushing a cork into a style of bottle with a depressed center.
The fact that it is displayed with the tach and some small C-clamps in interesting, and calls into question what kind of museum display it happens to be.
2189) Way too blurred to really make a guess at all. Sorry. 2190) Slips on over a small pipe. Might serve to keep rain out of an exhaust pipe until opened. Perhaps if I looked up Crestmark, I would learn more -- or perhaps not.Now to see what others have suggested.
Enjoy, DoN.