Cecil Moore wrote:

Jim Kelley wrote:

Cecil Moore wrote:
"Tilt" is very good advice for a variable mercury column.
In fact, the tuning length of the column of mercury could
be controlled simply by tilting the tube of mercury at an
angle away from vertical in the direction of horizontal.

How much does the length change when you tilt it at 45 degrees?

By the factor of the square root of two.

Sounds kinda like one of those mythical cable stretchers. :-)

ac6xg