New ways vs Old ways CNC vs manual

[SmithDoor]

With the tube method, you have to make sure there are no air bubbles or one end of the tube will be lighter in weight than the other, then you will NOT have level.

Try in a few modern Sextant they spirit level (they spirit fluid so does not freeze) No a modern nuke Aircraft carry is using a water for navigation. Aircraft use spirit level or mercury (no horizon )

Dave

 

[SmithDoor]

How about Jonhy come lately
Radio Compass and E6B.
. Lessthan 150 years.
Any ever use one ???

Dave