A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Brad Morris
Date: 2014 Jan 16, 14:31 -0500
They may be using the hezzanith mechanism, but as to the comparison between it and the one Worsley used, there is none.
That sextant had top of the line features, some patented. Some hard to use, like the binoculars that attach to the frame, for that whole horizon view. The sextant in the show appears quite ordinary.
The hezzanith feature refers to the endless tangent screw with automatic clamp. In other words, you could move the index arm about freely with the screw unclamped and then finely adjust with the screw clamped. This is just one of the patented features.
I'm watching Part 2 right now. This time they got the photograph of Worsley going the right way. I take note that they are "cheating". The sextant they are using does appear to be a Hezzanith, but it is a micrometer drum type, not a vernier type.
FWIW, I have a 1905 Hezzanith vernier sextant, and I cannot figure out what continent I am on with it. Micrometer drums sure are easier.
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