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Anyone know what a Vernac by Simpson Optical is?

guythatbrews

Cast Iron
Joined
Dec 14, 2017
Location
MO, USA
I found this in a collector's hoard. Have no idea what it is. Do you?

20220506_095403.jpg

Whatever it is it measures something in tenths.
20220506_095418.jpg

On the bottom is a dovetail mount and a little lens. If you shine a light through the lens the windows in the face light up. When you turn the ring on the face there is a line shaped like a scroll that moves through the window with the .022 in it.

20220506_095410.jpg

Looks like Simpson Optical was in Chicago. Web search found nothing. At least the way I did it. It is a neat little piece and maybe useful if someone knows what it does.

I'll add although this guy mostly collected toolmaker type stuff he does have a very little bit of optometry stuff too so maybe it is along that line.

Any ideas?
 

daryl bane

Titanium
Joined
Mar 12, 2002
Location
dallas,tx
This was the older pre -electronic equivalent of todays DRO's. You mounted it on the x/y axis , usually a mill, and was more accurate than the dials.
 

jmm03

Hot Rolled
Joined
Aug 8, 2004
Location
ventura,ca.usa
Cal explained it to a degree. I used to work for a company called Infrared Industries in California, it was what Simpson turned into. The Vernac came with a laser engraved scale that attached to your tool of choice and the read head that you have magnified the scale marks. Jim
 

guythatbrews

Cast Iron
Joined
Dec 14, 2017
Location
MO, USA
I think I understand. I don't remember the range of the vernac but maybe .050"? So before moving to location set the vernac then move until the index mark lines up with the appropriate .050 on the scale.

I haven't been around much jig bore work but way back the shop where I worked had a Pratt and Whitney jigbore with the micrometer length rods and a dial indicator index. I guess the vernac was a bit quicker method of location.
Was it used with glass scales?
 

guythatbrews

Cast Iron
Joined
Dec 14, 2017
Location
MO, USA
Cal explained it to a degree. I used to work for a company called Infrared Industries in California, it was what Simpson turned into. The Vernac came with a laser engraved scale that attached to your tool of choice and the read head that you have magnified the scale marks. Jim
Your post came in while I was typing my reply. Now I understand.

Thanks for the replies.

Does anyone have any use for this thing? I can't think of anything i need it for but i can lay hands on it if anybody wants it. It is destined for the estate sale else and more the shame.
 

gbent

Diamond
Joined
Mar 14, 2005
Location
Kansas
The readout head requires an engraved scale. I doubt if it was laser engraved, as it dated at least back in to the 1950's. The scale had marks every .025, as well as having decimal dimensions. The scroll that is visible on the face of the head was rotated to center the hash mark between the two lines of the scroll. Every .025 was read directly, the remaining 0-.025 was added to the direct reading. 35+ years ago I couldn't find the correct light bulb. The length from the base to the filament was critical. The best I could come up with required pulling the bulb holder from the housing slightly to get the reflection from the scale to appear bright enough to read. The differing location did induce some parallax error.
 
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guythatbrews

Cast Iron
Joined
Dec 14, 2017
Location
MO, USA
When I first saw this thing I looked on ebay and nada. Now there is a manual and alao a Vernac made by infrared industries. The Vernac is listed for $450 and judging by the description they don't even know what it is. Good luck with that, huh?
 








 
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