First at the Banaras Hindu University and then at the Punjab University and he had a reputation as a teacher .
Bhatnagar was a university professor for nineteen years from 1921 until 1940 .
First at the Banaras Hindu University and then at the Punjab University and Bhatnagar had a reputation as a teacher .
Bhatnagar was a university professor for nineteen years from 1921 until 1940 .