from The Century Dictionary and Cyclopedia
- n. A double quartz plate used in a form of saccharimeter (which see).
Sorry, no etymologies found.
(See fig. 44, where N is the nozzle of the lamp, H the first Nicol, Q the biquartz plate, L a lens, M the electro-magnet, with the heavy glass across its perforated poles, and P the second Nicol.)