Week 15 (1-30-17) Plimsoll Lines

Plimsoll. Samuel Plimsoll is the guy we credit for giving us our International Load Line on the hulls of ships. And which is why we rarely hear the phrase International Load Line. Who wants to say International Load Line when you can say Plimsoll line and mean the same thing?


From what we learned last week in class, different types of water ( salt water and fresh water) have different densities. And so, even though salt water and fresh water take up the same space, the more dense the water is (the saltier it is) items that sink in fresh water may still float in salt water.


So what the Plimsoll lines do on a ship is indicate the maximum load a ship can be filled up with cargo in a certain type of water. Which is why the plimsoll lines are different for salt water and fresh water.

What we’re doing here in class is taking clay which is denser than fresh water and seeing if we can turn it into a structure–a boat of some type that will float.


Most of us can do come up with something that doesn’t sink on the first try.


But it doesn’t necessarily mean we’ve made the best structure to hold the most cargo.


What we’re after is being able to build a boat that will hold the most pennies.


This is my gold medal attempt at home. 27 pennies.


And I felt slightly fantastic about this until Mrs. Ponraj’s boat…


Held 34 pennies. Ridiculous.


Ack. Must try harder.


Which is what we all did.


We pushed and molded and counted pennies, until each of our boats finally sank.


Then Mrs. Meier made this gem. Which crushed all previous records, sinking at 39 pennies. Goodness.


Mine, here, held 30 pennies good enough to tie for 3rd place. Sigh.


See any good ones?


Happy Day!


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