NavList:

Capt OM Watts in “The sextant simplified” suggests that a medium and a high-power inverting telescope might be useful for obtaining the most accurate meridian altitude of the Sun (time I suspect being more important than altitude, which will hardly be changing), he suggests that the high-powered scope is only of practical use ashore.  The ‘Old Devil’ Lecky suggests that a 14 or 15 diameters magnification is of value when using an artificial horizon for the same purpose.  I suppose with practice you could set the two edges a fraction apart and shout “Now” or “今” when they kissed.  Personally, I’ve only tried my 5x a couple of times; was never able to work out which way was up, and which way was down; so quickly put it back in the box.  DaveP