I Don't Get Out Much! But, IMO, the term *vernier* is suffering misuse in the context in which it is being used! The gear-and-cog for fine adjustment of the saw table should be termed *
Fine Adjustment Rack and Pinion*! For an understanding of what a true vernier scale
IS, check out this site:
http://www.tpub.com/math1/7e.htm
Vernier scales allow readings to be taken of *fractions* of .001" (or metric). What we see above on the Agazzani is only a protractor with a pointer. There is no true verner scale to find an exact reading
between degree marks. Although the gear drive does help fine-adjust the table (without bumping), all adjustments are by *eye* and depend on an individual's perception of what *RIGHT ON* really is, although an exact 90 degree reference may have been set with a precision square.