this post was submitted on 06 Sep 2025
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xkcd #3138: Dimensional Lumber Tape Measure

Title text:

A person with two watches is never sure what time it is, especially if I got them one of the watches.

Transcript:

Transcript will show once it’s been added to explainxkcd.com

Source: https://xkcd.com/3138/

explainxkcd for #3138

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[–] TempermentalAnomaly@lemmy.world 6 points 1 week ago (2 children)

Its 2x4 before drying and planing.

[–] valkyre09@lemmy.world 2 points 1 week ago (1 children)

Maybe I’m being daft (I probably am).

After wood is planed and dried, I thought it would have gotten smaller.

In the image, 9CM lumber measurement is smaller than 9CM metric. Meaning when 9CM lumber shrinks it’ll be even smaller than the 9CM metric.

Have I got this backwards?

[–] TempermentalAnomaly@lemmy.world 7 points 1 week ago (1 children)

The joke is when you purchase a 2x4, it measures 1.5x3.5 and not the advertised 2x4.

[–] valkyre09@lemmy.world 2 points 1 week ago

lol, learn something new every day!

[–] AnUnusualRelic@lemmy.world 1 points 1 week ago

The tree was 2x4, I've no idea what they've done with it.