Measurement Ruler I picked up but have no idea what the scale is for?

[MEASURE TWICE]

The mfr of the ruler you see is Dietzgen. The regular ruler by Westcott has inches on one side and goes to 16th inch increments. The other side center meter and mili meter.

The Dietzgen with six sides has and largest increment on the 10 scale with 1 inch having ten divisions. It also goes up to 12 I think inches.

The 20, 30, 40, 50, and 60 sides all make sense, with like 20 side has 20 divisions to the inch.

I guess this is an Foot Based Ruler, but decimal divisions. No 16th an 8th inch or finer 32th inch.

Is this for some building design and this needs math used this way? What else?

MT

 

[Tom from Rubicon]

Tool and Die, & Mold Makers generally work in Tenth's, Hundred's, and Thousandth of an inch fractions as opposed the English scale which is the 64"-32"-16"-1/8". Same basic inch, just different divisions. Only the last ten years did I start really get involved in ISO 9000 and heavily Metric.
Using a calculator to translate mm to ".
Being three sided, it is a Draftsman's scale. I have one somewhere. Just don't ask me where.

Tom

 

[Sidewinder Jerry]

It means 10 feet per inch and 20 feet per inch on a blue print. The blue print's legend will have in it which scales to use. Sometimes the legend on the blue print may tell you to multiply the scale by 10, 100, or a 1000.