Below is a scan from the back of my 1893 Brown & Sharpe Catalog.
It’s the beginning of a catalog within a catalog.
“Darling” refers to Samuel Darling, who had a partnership with Brown & Sharpe from 1866 until 1896 or so.
Here’s a screw & wire gauge made during that time. …
You stick the screw or wire in the slot and move it twords the narrow end until it stops. If it stops at ‘7’ then you have 7 gauge wire or a 7 gauge machine screw.
Below is a machinist’s rule marked “D B & S Prov R.I.”.
Some inches on each side have extra fine graduations for fine
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, or specialized work. They’re in 10ths, 12ths, 20ths, 50ths or hundredths of an inch.
Here’s the 100ths inch corner next to a common household tape measure to give you an idea just how small one one hundredth of an inch is. The tape measure is graduated in 16ths.
A narrow 4″ rule also by Darling, Brown & Sharpe. Graduated in 50ths on one side and hundredths on the other.