NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Sight tube: cross-wires repair?
From: Örjan Sandström
Date: 2019 May 25, 01:42 -0700
From: Örjan Sandström
Date: 2019 May 25, 01:42 -0700
the reason for female young black widow spiders is that their silk is thin and smooth and can be split for extremely thin crosshairs, also the elasticity made it easy to stretch tight without sag.
before etching glass crosshairs and drawing extremely thin platinum wires was "perfected" (Wollaston wire) around late 1800´s it was as thin as any crosshair could be made reliably.
