Does anyone know what this is????

[vacek]

In Photo 2 I have a 45 Colt as a size reference.

Any information would be appreciated.

[R.M.]

Looks like a revolution counter.

[Nickle]

Thanks for jogging my memory. That does like a revolution counter, and not a real recent one at that.

[Jim]

Antique Starrett revolution counter (https://www.google.com/search?hl=en&site=imghp&tbm=isch&source=hp&biw=1117&bih=541&q=antique+starret+revolution+counter&oq=antique+starret+revolution+counter&gs_l=img.12...149.149.0.4630.1.1.0.0.0.0.75.75.1.1 .0...0.0...1ac..18.img.mxqA-Gg67Io)

[mdi]

I believe a "revoltion counter" is called a "tachometer"...

I've used similar mechanical tachometers for checking hydraulic motor drives on heavy equipment.

[W.R.Buchanan]

You all are right !!!!!!!!

They were used to check the rpms of any rotating shaft back in the day. It is only a rev counter. You counted revs for a period of time and then calculated RPM's.

These work best on slower moving machinery since it is hard to not have the tip slip on the shaft when running fast.

I had one when I was a Millwright. It got stolen out of my box because it was so cool some assole just couldn't resist.

For rev counting on higher speed machinery there are little Vibro Tachs that have a bunch of different length reeds which vibrate when their individual frequency is hit.

That got stolen as well!

Randy

[bear67]

I have 3 of these in my "stash". Used to use them a lot setting the speed on early combine harvesters. Run edible beans really slow and white clover very fast. Useful tool and out of the past.