(urth) Terminus Est

[Jeff Wilson]

John Smith wrote:
> Another problem:  If
> the empty part of the channel is filled with air, the
> pressure of the air would impede the mercury from
> flowing freely when the sword descends.   The empty
> area needs to be a vacuum.

This is exactly how Toricelli made a vacuum in 1643, the tube being 
equal in length to TE.

-- 
Jeff Wilson - jwilson at io.com
< http://www.io.com/~jwilson >