When I explained to my eight year old son that ancient peoples didn't have clocks like we do today, he was surprised. I don't think the thought had ever occurred to him that without batteries or electricity, the hands of a clock simply couldn't move.
In Ancient Greece, they used a water clock to time short events.
It was called a clepsydra (KLEP-sye-druh). I thought it would be fun to make
our own version of these ancient clocks.
What You Need
masking tape
fine-tip permanent marker
two of the same empty plastic beverage bottles
thumbtack
pitcher of water
timer (we used a stopwatch app on the iPad)
craft knife (to be used by an adult only)
funnel to make pouring easier
How to Make It
Remove the labels from the beverage bottles for clear
viewing to the inside.
An adult should cut one of the tops off the bottle with a
craft knife. Recycle the top; you won't need it. With the top cut off, the bottom of the other bottle should fit
snuggly down into it. Label the bottles if you'd like (bottle A is the complete
bottle and bottle B is the one you've cut).
Turn the complete bottle over (bottle A) and put a
thumbtack through the center of the bottom of the bottle to make a small hole. (This is the hardest part of the whole project.)
Mark on this bottle where the full line is (figure this
out by nesting bottle A inside the bottle B; the distance from the bottom of
bottle B up to the bottom of bottle A or slightly below is where you should
draw the line on bottle A). Note: We botched this up but it's important to know
how full to fill your bottle each time. You'll want to be consistent.
Grab a length of masking tape and adhere it vertically to
the side of the cut bottle (bottle B).
Now get your timer and the pitcher of water ready. Pour
the water, using a funnel if desired, into the neck of bottle A (your bottles
should be nested) and immediately start the timer. Pour up to the fill line on bottle A.
When one minute passes, make a small mark at the water line on the masking
tape on bottle B. Continue to mark the minutes until the water has completely emptied from the
top bottle into the bottom one. We only marked the first 10 minutes, but you
can mark as many minutes as you'd like.
Now you can dump out the water and put the timer aside.
Another pour of the pitcher and you can calculate how long something takes with just your water clock!
This great activity was adapted from instructions in the book Spend the Day in Ancient Greece.
I think there is a book about that from The Warlord's series by Virginia Pilegard that talks about invention of water clocks. I am definitely pinning this post and featuring it next week in science round up. Thanks for co-hosting After School!
ReplyDeleteGreat activity!
ReplyDelete-One note, though. It states above "without batteries or electricity, the hands of a clock simply couldn't move." I have to smile at that, but I know I'm probably a LOT older than this clever mom, too.
Long before electric or battery clocks (but after most water clocks) watches and clocks had springs to move the hands. The spring was rewound every day by a key or a stem of some type.
Again, this is a fun and educational activity! Thanks for sharing! - Ron H