Optical comparator?

[tmac1956]

All:

Is this an optical comparator? The seller doesn’t seem to know.

http://www.ebay.com/itm/351077232511?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

Thanks!
Tom

[arutha]

I have never seen anything like this before and am at a loss. I have looked through vintage optical comparator images on google but this does not look any thing like what it was bringing up.
Paul.

[chris mabbott]

That makes two of us, it isn’t like the more “modern” ones I’ve seen where both items are kinda superimposed for size.

This one looks like a magnified slide rule…

[david pierce]

Tom
A very wild guess would be a 19th century version of a staging microscope but who knows?
david

[david pierce]

Tom,
Take a look at Ebay item #121346793337. That can magnify a small watch part to over one foot in size. The micrometers read directly in 1/10,000 of an inch and move the actual part across the screen.
david

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