POLITENESS. The operation of polishing optic-glasses, after being properly ground, is one of the most difficult points of the whole process. See TELESCOPE.
POLITENESS
article · 155 chars · lineage ↗ · page image at NLS ↗
article · 155 chars · lineage ↗ · page image at NLS ↗
POLITENESS. The operation of polishing optic-glasses, after being properly ground, is one of the most difficult points of the whole process. See TELESCOPE.