What might these be?

[middle.road]

I have no clue on these two pieces. I just grabbed them 'cause they looked interesting.
The black holder has a 5/8" bore in the end and the cap screws on.
The 'hook' has two fine rack and pinions on it.

 

[benmychree]

I wonder if the hook thingie has something to do with holding microscope slides?

 

[MrWhoopee]

I wonder if the hook thingie has something to do with holding microscope slides?

We have a winner! I knew I recognized it but couldn't remember from where. It holds and positions the slide on the microscope stage, hence the fine movement in both axes.

Microscope Slide Holder

Fits Omano monocular microscopes Precision-machined components Graduated markings for easy reference Smooth 57mm by 32mm of X-Y axis travel Does not fit the OM150 series microscope

www.microscope.com

 

[mmcmdl]

Pic # 1 . It could be used for a slitting saw with a straight shank arbor . May not be the intended original purpose , but that's would I would make out it .

 

[middle.road]

Thanks guys!
I'll turn over the slide holder to my Better-Half and she if she can flip it, the arbor hunk will go into the 'Future Projects' bin.