Ruler: Type and how to use? : r/whatisthisthing

Types of Measuring Rulers

What are these tools/instruments for from 1772? Black bumpy

Aluminium ruler with Dupont paint brands on it. the ruler has

What's the deal with this weird ruler? : r/whatisthisthing

Roll of tape with 3 columns of numbers, no seeming pattern

A smallish rectangular object with holes punched into it made of

Found in a pair. Black metal, weighs the same as a large cell

Gilded iron pin around 11.5cm. End swivels and pivots. : r

Interesting piece of lead found while metal detecting. The item is

17 long numbered stick. Numbers go from 1-84. Found in my garage

iGaging Rigid Stainless Steel 4R Rulers (1/8, 1/16, 1/32:, 1/64

What Is This Thing?”: 50 Times People Stumbled Upon Mysterious