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Very early Caliper J R BROWN & SHARPE MAKER PROV RI

Sstrave

Plastic
Joined
Jan 28, 2022
I have a very old caliper marked J R BROWN A SHARPE MAKER PROV. RI

It's three inches long and consists of three parts as pictured.

I suspect it was made not long after the invention of the linear dividing engine. Every inch is marked in a different scale.

The various divisions are (3 to a side) 16, 32, 64 - 20, 50, 100 - 12, 24, 48 - 8, 14, 28

I think they were showing what the engine could do. I'm lucky to have the whole thing

[/ATTACH]DSC00477.jpgDSC00478.jpgDSC00480.jpg

I'd sure like to know more about it. Thanks Steve

Here's a couple of scans.

Front.jpgBack.jpg
 
Last edited:

rivett608

Diamond
Joined
Oct 25, 2002
Location
Kansas City, Mo.
These came out I guess in the late 1860s and were offered under the J R. name in the 1868 catalog. They were offered in a number of different graduations like yours so that is not a sample or prototype. It also appears to have been shortened for some reason as the body appears cut in half. They were made in 3" and 4" lengths.
 

Sstrave

Plastic
Joined
Jan 28, 2022
I think you're right - Looked at the ends under a scope and there are some visible tooth marks. Have no idea why.
 

Sstrave

Plastic
Joined
Jan 28, 2022
It seems that these were made with multiple scales. The MAKER designation seems to appear on earlier stuff.
 








 
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