Humidity stick?

[Pirate]

Got an idea and think I read about it somewhere.
It's a stick for measuring humidity.
2 strips of wood glued together. Different species, or grain direction.
When humidity changes, the stick bends, because of different woods.
Anyone have a link to article, or suggestions?
Thanks

[toolmiser]

Sounds interesting, and I have nothing, sorry

[Gary G™]

Don’t you live in Florida?
Just put your head outside; you’ll know the humidity changed.

[geraldonj]

Got an idea and think I read about it somewhere.
It's a stick for measuring humidity.
2 strips of wood glued together. Different species, or grain direction.
When humidity changes, the stick bends, because of different woods.
Anyone have a link to article, or suggestions?
Thanks

I think that is a great idea if you can calibrate the deflection at different humidities, at least in the range of interest.

[Phil Thien]

I got nothing other than it sounds like a neat project.

Cross-laminations of a single species may be doable, if thin enough (think veneers?)

Could lookup woods that are most and least reactive to moisture changes?

[MichaelMouse]

Got an idea and think I read about it somewhere.
It's a stick for measuring humidity.
2 strips of wood glued together. Different species, or grain direction.
When humidity changes, the stick bends, because of different woods.
Anyone have a link to article, or suggestions?
Thanks

Believe Hoadley's book shows a rip not quite through a board displaying end grain with the opposite sides closing/opening.  Too lazy to dig it out to get the page in my edition.

[srv52761]

Other than a bendy piece of wood, I am not sure you’d be able to measure much.  Wood also expands as a function of heat.  Without knowing the temp you couldn’t tell if the expansion was a function of increased moisture content or increased heat.

[Arlin Eastman]

Use this

https://buythermopro.com/product/thermop...gJb4PD_BwE


Or this


https://www.lowes.com/pd/BestAir-1-oz-Hu...lsrc=aw.ds

[rectangle618]

Got an idea and think I read about it somewhere.
It's a stick for measuring humidity.
2 strips of wood glued together. Different species, or grain direction.
When humidity changes, the stick bends, because of different woods.
Anyone have a link to article, or suggestions?
Thanks

This looks close to your description:
https://www.youtube.com/watch?v=B9FPBQzlhbc

OK for a Cub Scout project, but Arlin's suggestions would be more practical.

[ianab]

This looks close to your description:
https://www.youtube.com/watch?v=B9FPBQzlhbc

OK for a Cub Scout project, but Arlin's suggestions would be more practical.

I think that's how you would do it. One strip is long grain, so it wont change length enough to matter. The other strip is cross grain, laminated to end grain. That can move. I think it's also a good demonstration of why you don't glue up cross grain joints, and you probably have to chose a glue with a little bit of flex. If you scaled the stick up too much the cross grain movement would probably bust the stick at some point, but a small piece like that can bend enough to hold together. 

The small piece can also change moisture fast enough to predict the weather, not just the season. 

It's something that you would make as a novelty, and it shows how wood does move with humidity.