I want to know where has he placed the tube and how he adjust the height ? Please refer the link below marked in violet http://lnr.li/m19fP Please explain using simple diagram for better understanding
I think the setup is too trivial for most history pages to bother with, but there is a picture in the book "Young Explorers’ Guide : The Search for Ingenious Treasures" . Unfortunately, that picture does not display in the Google Books search.
This is a simple case of a lever arm: the mirror remains at a fixed distance from the pivot, while the lead weight can move. According to other descriptions, the mirror is positioned by means of a pulley& rope which presumably is tied down. The movement of the lead weight is almost irrelevant other than to provide stability for the entire lever arm at any mirror height.