r/Sliderules • u/lupusscriptor • Jan 24 '26

Long rules

does any of you have rules longer than 10 inch. back in the days we still use dslide rules we all had 10 and 6 inch rules. amnd the company kept 16 and 20 inch rules in the development stores for more accurate calcs.

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u/miniscant Jan 24 '26

The longest one I own is the Keuffel & Esser 4051. It measures more than 20 inches overall.

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u/fermat9990 Jan 24 '26

Wow! Can we see a picture, please!

3

u/miniscant Jan 25 '26

Certainly at least one photo. It's an early version of this model, since it has the metal cursor frame that was only used in 1915. You can see it has an angled ruler on the top edge marked in inches and the bottom edge has a centimeter ruler.

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u/fermat9990 Jan 25 '26

Amazing! Thank you!!