here is an example
The growth of the railroads led to the abolition of local times, which was determined by when the sun reached the observer's meridian and differing
from city to city, and to the establishment of regional times.
In this case, how does comma change the meaning?
Can any one explain where to use comma before which and where not to? Im alw confused by this
AFAIK, comma is used when the phrase/clause/element is non-essential.
It will be good if you can give some examples.