1753) This looks like a sharpening iron for a carving knife (turkey carving, not wood carving).
It is like a file with the grooves parallel to the length of the iron.
I've not seen one with what looks like an articulated hanging ring on it before, however.
1754) looks like something designed to clamp something until the rope is slacked. Not sure for what, however. 1755) Looks like something to turn a tenon on the end of a wagon wheel spoke. 1756) Some kind of spreader -- not sure how it is mounted. 1757) Gralab darkroom timer. A fairly old one of the pre digital versions, based on the knob. The knob allows you to set seconds within a minute until it trips, the minute hand (shown at eight minutes to go) moves in clicks to add minutes to the seconds. You grip it by the bent-up tip.It can operate a device connected to the outlet on the side (likely the light in an enlarger most of the time) or just sound a rather loud and annoying buzzer when the time runs out. The switch on the top is likely to silence the buzzer -- I had to add one to mine if I remember correctly. :-)
1758) Absolutely no idea.Now to see what others have guessed.
Enjoy, DoN.