Lambert's Original Proof that $\pi$ is irrational. I am trying to find Lambert's original proof that $\pi$ is irrational. Wikipedia has a little description but it is quite lacking. Can someone direct me to Lambert's original proof or post his proof here?
Thanks.

There is a proof here, but i am not sure if it's helpful or not: http://www.pi314.net/eng/lambert.php
Here is a link to the original article: http://www.kuttaka.org/~JHL/L1768b.pdf
